Aren't You a Heartbreaker? How Come You Still Have Your First Kiss?

[Older Woman, Younger Man] [A Scheming Older Sister] [A Cold CEO on the Surface] [Pure Romance] "My best friend is a total player. You can't fall for her!" "She's been around the block without ever getting attached. She can't stand pure-hearted boys like you!" Ever since sixteen-year-old Su Cheng met his older sister's best friend, Liu Ruoxi, his sister had kept hinting, whenever she got the chance, that her friend was a player and he must never fall for her! And just like that, Su Cheng's youthful crush came to an end! That is, until twenty-one-year-old Su Cheng unexpectedly moved into Liu Ruoxi's home, discovered that she liked him too, and eventually even stole her first kiss...