Karina has been on a date with Ryujin, the hot girl from the campus library. The date doesn't end well because Karina has a problem. Karina needs help and she asks her best friend Winter for a 'big' favour. Winter hesitates because it's a big deal, but Karina is her best friend and she just can't say no. +18 Converted.

Karina Yu, a gorgeous and cunningly smart woman who's always up for anything that piques her interest, receives a 'tea' from one of her friends, Ningning. The tea consists of one person, and that is the charming singer of Kwangya Academy, Winter Kim. The girl who is recently suspected as a 'red flag'. It didn't really intrigued Karina at first, not until a party in a friend's house happened and now Winter is suddenly taking over Karina's mind.