What episode is the childhood stealing of a gun?

Dear, dear, dear, episode 30, children kiss guns.

In episode 12, Han and Tong Nian almost kissed, but the real kiss was in episode 30. Gun asked Tong Nian if he wanted a ticket, and Tong Nian bowed his head and acquiesced. After that, Tong Nian thinks of himself as something strange, breaks up when he wants to break up, and makes up when he wants to make up. The gun kissed Tong Nian without saying a word, blushed for Tong Nian and took the initiative to kiss the gun.