Crushes Reverse (2018)

Both are short length dramas with four people in a love quadrangle. The same actor is the ML in both, and the tone/feel is very similiar.

Both are set in school and the FL has a crush on someone who likes a different girl. The ML is the FL's classmate and friend and secretly has a crush on her which she doesn't notice. Both MLs tease and sort of pick on the FL, with both couples having a bickering but affectionate sort of relationship.

Frenemies to romance relationship between the mains. FL likes another boy first. ML falls for her long before she falls for him. Both are short length dramas.