1. BaekHyun and Hera - The Moon Lovers

2. Lee Dong Wook and Yoo In Na - Goblin

3. Nam Joo Hyuk and Park Min Ji - Love Trap
A much-loved sibling couple in Korean dramas, despite being supporting characters, are Jang Bo Ra (Park Min Ji) and Eun Teak (Nam Joo Hyuk) from "Love Trap". Their relationship, although between an older sister and younger brother, feels remarkably balanced and is filled with innocence, cuteness, and sincerity.
Bo Ra is hesitant about falling in love early because she fears her best friend will be left all alone, even though she has deep feelings for Eun Teak. Meanwhile, Eun Teak constantly seeks Bo Ra's attention, following her everywhere and obeying her every command. Their playful dynamic has provided plenty of comedic moments for viewers.

4. Go Kyung Pyo and Ryu Hye Young - Reply 1988

5. Kim Bum and Jung Eun Ji - That Winter, the Wind Blows

6. Yoon Sang Hyun and Kim Sa Rang - Secret Garden

7. Kim Bum and Kim So Eun - Boys Over Flowers
Yi Jung is the Casanova of F4, known for his charm and charisma. A skilled pottery artist, he also owns the largest art museum in South Korea. His wild lifestyle begins to change when he develops feelings for Chu Ga Eul (Kim So Eun).
Kim So Eun plays Chu Ga Eul, who is Jan Di's best friend. The two work together in a porridge shop. Eventually, she confesses her feelings for Yi Jung, leading to emotional developments and transformations in Yi Jung's life as he learns to love and change.

8. Roh Jeong Eui and Choi Bo Min - 18 Again
Hong Shi Ah, played by young actress Roh Jeong Eui, is the first twin daughter of Hong Dae-young and Jung Da-jung. She is a popular high school student with many friends but has a rebellious streak.
Choi Bo-min portrays Seo Ji-ho, Hong Shi Ah’s class president and childhood friend. He is always looking out for her, and the two eventually forge their own paths and become a couple to be admired.
"18 Again" is a coming-of-age story about mistakes, dreams, and growth. It reminds us that only through our failures can we truly mature.

9. Seo Ji Hye and Kim Jung Hyun - Crash Landing on You
In *Crash Landing on You*, Seo Ji Hye portrays the beautiful North Korean woman Seo Dan, who was once engaged to Ri Jeong Hyeok (Hyun Bin). Kim Jung Hyun plays the character of the conman Gu Seung Jung. Though their roles were secondary, both received a lot of love from fans. Their undeniable chemistry and the humorous scenes they shared were a hit during the airing of the drama. Notably, Gu Seung Jung's death in the final episode left many viewers feeling frustrated.
Though *Crash Landing on You* has long since ended, its impact still lingers with audiences. While the main couple, Jung Hyuk (Hyun Bin) and Se Ri (Son Ye Jin), were given a perfect ending, the secondary couple, Seung Jun (Kim Jung Hyun) and Seo Dan (Seo Ji Hye), were tragically kept apart. The heartbreaking conclusion of their romance still stirs emotions in viewers, as their journey from enemies to lovers made it clear that they deserved a happier ending.

10. Song Ha Yoon and Ahn Jae Hong - Youth Over Flowers
We all know a couple like this in real life. They've been together for so long that it seems nothing could ever tear them apart. This is the story of Seol Hee (played by Song Ha Yoon) and Joo Man (played by Ahn Jae Hong). Their relationship shows a truth: when we’ve been with someone for too long, we often start to take their presence for granted.
There are no dramatic fights or tearful reunions here; Seol Hee and Joo Man's love story is gentle and sweet, slowly working through their issues and rebuilding from scratch. Together, they evolve and grow in love, taking their time to rediscover each other.

11. Lee Da In and Do Ji Han - Hwarang
One sweet secondary couple provides the perfect antidote for those who might be losing patience with the complicated love triangle of the main characters in the show. Soo Yeon (played by Lee Da In) and Ban Ryu (played by Do Ji Han) always bring a smile to viewers’ faces every time they appear on screen.
Normally, Ban Ryu is a cold, moody, and somewhat pessimistic guy. But whenever he’s around Soo Yeon, he turns into a soft, harmless “bunny.” Many people compare Ban Ryu’s behavior around Soo Yeon to a deer frozen in the headlights. Thankfully, this deer now has a fierce girlfriend with a sharp voice to protect him!

12. IU and 2PM Wooyoung - Dream High
Known as the “Milky Couple,” Pil Suk (played by IU) and Jason (played by 2PM’s Wooyoung) captured the hearts of fans even more than the main couple in Dream High.
The characters grow together, with Pil Suk evolving from the “Sushi Girl” into a rising music star, while Jason transforms from a flashy, fake guy into a lovable, jealous boyfriend. Many viewers wished Jason had fallen for Pil Suk back when she was still the chubby girl, but considering Dream High aired in 2011, the couple’s development seems quite fitting for the storyline.

13. Park Hyung Sik and Lim Ji Yeon - The Penthouse
Chang Soo (played by Park Hyung Sik) is a wealthy heir who has always been indifferent to love, but everything changes when he meets Yi Ji (played by Lim Ji Yeon), a naive, optimistic girl who captures his heart. Despite having almost nothing in common, they eventually realize they can’t live without each other.
Unlike the complex, scheming romance between Yoon Ha and Joon Ki, the love story of Chang Soo and Yi Ji is simpler. They just know that they love each other and want to be together, ready to face any obstacles that come their way. However, when Chang Soo's mother finds out about their relationship, she forces them to break up. Will Chang Soo be able to fight for their love and protect it at all costs?

14. Kang Min Hyuk and Krystal - The Heirs
In addition to the main story of the rich heir Kim Tan and the poor girl Eun Sang, audiences were also captivated by the love story of Lee Bo Na (played by Krystal), a beautiful and talented girl from a wealthy family, and Yoon Chan Young (played by Kang Min Hyuk), a kind-hearted, smart guy with a more humble background. Their relationship is free from the usual issues of status and third parties.
Their playful jealousy moments only make their romance more endearing. Their love story was so captivating that even after filming wrapped, fans continued to cheer for them to get together in real life.

15. Jin Goo and Kim Ji Won - Descendants of the Sun
The military romance between Sergeant Seo Dae Young and First Lieutenant Yoon Myung Joo played a significant role in the massive success of 'Descendants of the Sun.' Kim Ji Won's portrayal of Myung Joo, a strong-willed woman with a rebellious yet principled nature, was truly made for her.
Myung Joo, the daughter of a high-ranking general, defies her father's wishes to join the military, proudly embracing her identity as a soldier. She falls in love with Sergeant Seo Dae Young (played by Jin Goo), a lower-ranking soldier. Their love blossoms from their first meeting, and they face numerous hardships and dangers together, always protecting each other.
