Su Muchen regretted only two things in his two lifetimes: 1. The first time he went to the Su family with the so-called father's love and affection. 2. Even if you don't want to go back, you can't stop the man from this life from approaching you.
Before his rebirth, Su Muchen was still a little curious about his father. After his rebirth: What? Is that guy coming? Escape immediately
After being reborn, he vowed never to get close to that man.