The System Asked Me to Increase My Favorability

I dreamed up this story, and I'm going to use this as my first novel. Lin Yin closed himself off because of something that happened in junior high school. At the invitation of a friend, he met the protagonist Gu Yi. When he returned home, Lin Yin felt something strange about his body. He didn't have any hidden illnesses in the first place. Lin Yin didn't care about it, so he went to bed. In the middle of the night, he heard someone say "I am your system" again in his sleep. From today on, you must attack the protagonist Gu Yi and gain his favorability. After the favorability is full, you can go back to the past and prevent that incident from happening. Of course, you can also abandon this and change to something else. Lin Yin: I seem to have fallen in love with him Gu Yi: Ayin, can I like you? Intention: love