After the Reunion, the Young Master Had an Affair with Teacher Xiao Song.

[ABO double male protagonists focus on writing + Nianxia (four-year age difference) + reunion after years + secret love coming true + unconventional teacher-student relationship + 1v1 double cleanliness] An Alpha × gentle and tough music theory teacher Omega (B to O) who was forced to change from a lively and cheerful young master to a reliable boss. In order to pay off his debts, Song Shixu entered the entertainment industry, which he had no intention of doing. After being injected with unknown drugs, Song Shixu was rescued by a young master who had taught him for a year a few years ago. Four years later, the lively young man at the time has become much calmer despite many changes. Later, Song Shixu discovered that Shi Beichen was still the same as before. The only difference was that the guy who was always making fun of him had secretly been in love with him for many years. … When they reunited earlier than expected, Shi Beichen suddenly discovered that Song Shixu, who was supposed to be living a good life, had been bullied. Shi Beichen thought: If he had known that Song Shixu would not take care of him, he should not have gone abroad because he was worried that Song Shixu would be implicated. Shi Beichen also knew that he only had this choice back then. "Shi Beichen, are you stupid?" "It's not stupid, it's like, it's love." "Teacher Xiao Song, you were the first to appear in front of me before and now. I will never let you go." This is probably a story about an ardent eighteen-year-old boy's deep-seated secret love that received a tender response from his teacher Xiao Song four years later.