Kissing for No Reason) The Male Lead Screams at the Female Lead After Knowing the Truth, Then Disses Her

This is all I could think of.

The male lead, who was sly and playful in the beginning, is now adding a pure love vibe, creating situations where Da-rim can open up and tell him everything herself lololol

With a younger sister named Ha-young, he's the main attention-grabber in the middle, casting a spell on Da-rim, telling her to come to him, to properly talk and explain, lolololol