Ugly Alert - Shin Joo Yeong and Gong Hyeon Seok. Joo Yeong is a rich girl and is very infatuated with Hyeon Seok, but he doesn't have any romantic feelings for her. So, basically Joo Yeong is trying to gain his love and there are a lot of cute/funny/sweet scenes between them. I really loved their chemestry! And I know this drama it's long, but it's so worth it! I loved everything about this drama and I can't stop recommend it!
You Who Came from the Stars - Song Yi tries to gain Min Joon's attention after completely ignoring her, and at some point, she realises she's in love with him and he also falls for her. Though, they are the main couple in the drama.
Smile, You - Jung In eventually falls in love with Hyun Soo, but he doesn't like her until later on. It has the enemies to lovers trope, but their whole relationship is so fun to watch! (*main couple)