The second lead syndrome is kicking in strong, but we all love to see a second couple to have a happily ever after apart from the main leads. Here are some of my favorite Kdrama couples.
#1 Eun Tak and Ah Reum (Romantic Doctor, Teacher Kim 2)

The face of ER, Nurse Park Eun Tak (Kim Min Jae) is passionate, caring, and calm. He surprised everyone when it comes to relationships, he is really straightforward and confesses his heart to Ah Reum (So Joo Yeon). I need to see more of the couple’s interaction in Doldam Hospital.
#2 Grim Reaper and Sunny (Goblin)

Oh, let’s not debate how much every single soul (from earth and the dead) loves this couple. The amount of hardship and love crosses more than one lifetime. The chemistry is so well accepted, Lee Dong Wook and Yoo In Na have their own drama after Goblin. Check out Touch Your Heart.
#3 Seung Jun and Seo Dan (Crash Landing on You)

How many people cried when they saw Seung Jun (Kim Jung Hyun) go back to save Seo Dan (Seo Ji Hye) knowing it is a one-way journey. The eureka at the final moment of his life is heartbreaking to hear it.
#4 Won Seok and Ho Rang (Because this is my first life)
The seven years old couple went through more breakup and patch back than any other couples. Even though they managed to keep the fire burning, the last blow almost took everything away. The problem Won Seok (Kim Min Seok) and Ho Rang (Kim Ga Eun) face is so real.
#5 Seo Joon and Hae Rin (Romance is the bonus book)

Both so passionate about their work and met through projects. Seo Joon (Wi Ha Joon) and Hae Rin (Jung Yoo Jin) did not hit off in the beginning. Like a romance-comedy book, they happen to be by each other’s side at the lowest point and realize how they are meant to be together.
#6 Choi Woong and Min Chae (Flower Ever After)

Young couple held hands since college, they walked a long way and finally rented an apartment together. Just then things start to change and they want different things in life. Thankfully, they made a sequel just for the couple. Check out The Best Ending to see what happens next.
#7 Chan Yeong and Bo Na (The Heir)

From the beginning of the drama all the way to the end, they are almost like the constant in the drama. The down-to-earth Chan Yeong (CN Blue’s Kang Min Hyuk) fall in love with the spoiled princess Lee Bo Na (f(x)’s Krystal Jung), the bickering and over the top cheesy lines just make you want to see them more.