C215 The only clue he had was broken

"Why is there a password on top of this box?" When Chen Xi and Chen Kunlong had gotten the box from the other rooms, he had already noticed the password on the box.

"Your date of birth."

"It was like this when your mother gave it to me."

"I opened it once in the middle and took out the necklace. I put it away alone: I never thought that Yier would take it out to play with and throw it away