What episode is Wei Zi's hand in hand?

"But, I'm so scared! If this happens again today, I'm not sure I will lose my mind and do something crazy! I'm really crazy and scared for you. You are so strong and fragile, I don't know how to protect you! How can I put you in my pocket and keep you away from harm! " Erkang was worried and pitiful, and his eyes were red.

-from 15 episode.