He is a very bright and kind person who will go out of his way to help the people around him. His main ability is super speed. 

In the past, Ji-U had no friends because he was afraid that people would discover his powers and those they discovered would treat him like a freak. The first friend he made was a stray cat, which led to his adoration for cats today.

His mentor is Kayden Break, who started to live with him. He is friends with Ji-Seok Yu, U-In, and Su-Bin Lee.

Jiwoo is a kind-hearted young man who harnesses the lightning quick reflexes of a cat to secretly make the world a better place – one saved little child or foster pet at a time. Kayden is a secret agent on the run, who finds himself stuck in the body of a…um…decidedly fat old fluffy cat. Together, armed with Jiwoo’s super powers and Kayden’s uber-smarts, they’re out to fight those forces who would let evil rule this world. That is, if they can stand each other long enough to get the job done.
<br><br>(Source: WEBTOONS)

Ji-Woo Seo