The protagonist sends a message to his sweet and clingy girlfriend whom he has been dating online for half a year. Unexpectedly, an identical message pops up on the computer screen of a new cold-hearted and abstinent university professor? After the two discovered each other's identity, they were sweet and coquettish online, but serious and distant offline. While I was pretending to be obedient and listening to the class, I was secretly dating her online. When my vest fell off, this teacher-student online love affair was a mistake, and it was so sweet!