Wang yi was originally a system which became a human being through whatever heavenly principle chuchu, and the ML (I forgot is name tf) was his ano, umm, his human. And the cat is Wang yi's cat which became his system. The ml sealed his own memories so he could find Wang Yi someday and had an alliance with the cat. So then Wang Yi reincarnated, had a childhood, died all the yada yada. And now they're gaining their memories back, ok goods(๑•ㅂ•)و✧