I don't get chapter 50, can anyone explain what happened to the young (?) Him?

The young MC is waiting his brother (woo he jae) but he never come, so he lied to hong soyeong about his name (since he already promise to never revealed his name), instead he take woo hejae name.

Now, since little MC meet "woo he jae", so he can revealed his real name, thats woo lee rok.

The MC never meet his brother, so he take his name. And little MC meet woo he jae, so he can use his real name. Thats it ヾ(☆▽☆)

Ohh i totally forgot the part about him having an older brother, thank youu Σ(っ°Д °;)っ