Chen An will always remember his boyhood. That period of time was hidden deep in his memory, but it kept popping up in times of crisis and forcing him to face it again and again. Mu Kang would never escape. He knew what the weakness of his fragile bait was. He straightened Chen An's face and made him look at that time with his eyes again. After being tempered again and again, he would eventually slowly forget it.
Chen An: "Mu Kang may not be a good person, but he taught me how to forget sadness."
Mu Kang smiled: How could you let those memories without me account for most of your memories?
To put it simply and crudely: Poor Chen An thought he had found the savior of life, but he didn't expect that he would step into a deeper abyss, which seemed like heaven.