Is There Something Wrong with Being Reincarnated as Jing Dan?

An extremely chuunibyou and melodramatic OOC story Probably just writing practice, so it's free I'm a bit stuck, so updates will come whenever Jiang Chuan Shuo died. When he opened his eyes again, he was Hiro Mitsuya. Wait, did someone hand him the wrong script? Other people transmigrate with a System and a golden finger. He ended up inhabiting the body of a character he loved, sharing it with the original owner as two souls in one body. Fine. Since he was using the guy's body, he'd help him protect the people he wanted to keep safe. It's just that he really didn't mean to scare his friends and family! Help! There's a terrifying blond guy with dark skin chasing me! = Hiro Mitsuya felt that something wasn't right. He found that he occasionally forgot things, but they were all basically inconsequential, so he blamed it on the aftereffects of his aphasia. Until one day after entering the police academy, when he saw a blurry tattoo shaped like a wine glass. “Kei?” His black-haired, violet-eyed friend turned curiously. “What's wrong? You've been spacing out.” “It's nothing.” He realized he couldn't control his own body. Then, to his shock, he [saw] himself smile calmly and warmly. “It's almost curfew. Let's head back.” = A few years later Contact: How's the undercover operation going? Hiro Mitsuya: Great. I'm already the Boss. Contact: ? = PS: *No romance, all relationships are platonic, happy ending, save as many as possible. *The protagonist won't have his own body, but there will be a canon-compliant explanation for the two souls sharing one body (you know how it is). *The protagonist is firmly on the side of the good guys, but his methods may be morally gray. It has to do with his background. *There may be some selfcest elements with Hiro, but it's genuinely romance-free. *More notes to come. Theme: Turning back the tide of time