Regression Series (Went back to the past)

MC is in the entertainment industry who regressed and is using his diary to stop the bad things that will happen to the people who stayed with him till he died. He now uses his diary to get better opportunities for the idols and actress that he handles.

After dying bc of her husband's mistress/ her "bff", MC regressed and is back for revenge. Finding love in the process, she eventually succeeded in taking out the trash in her life with the help of her dad who is the case of the character's regression.