If you were asking why he wanted a Low key character? Because he did not really like the attention of other people. Also, with his system, he can grow stronger, and faster than others, so if he really didn't hide his power, everyone would be suspicious of him and want to know his secrets. It can even harm his family.
Also, there was the Geon Army. That mysterious lady told him to hide from them because he wasn't strong enough. Well, he just cleared his head. Enough thinking, let's go for a walk. Well, I think those children were practicing this time. Let's go there. Sam came out of his house and started walking toward the training grounds.
