Rebirth: Bind to Protect the School Beauty System

[Rebirth and time travel] + [System] + [High martial arts male protagonist] Chen Xu is a mercenary who was betrayed by his teammates while performing a mission. The bullet passed through his chest and fell into the sea. He woke up and was reborn as a senior in high school when he was 18 years old. He was bound to a system to protect the school beauty. Chen Xu just wants to complete the system tasks and live his life comfortably, but the school beauties he protects start to circle around him... The grievances between black and white, the pull of various school beauties...