No, it’s not the same one that he wore in chapter 1. The user is right: Yeongwoon is wearing a white T-shirt in chapter 1, but in chapter 2 he is wearing a white button-up shirt.
But they are wrong because we are going to see what happens to Yeongwoon which leads to the beginning of chapter 1.
There is are a few theories about his shirt change:
1. The author might redraw the panel which they might also change his shirt to a T-shirt
2. One of those guys wear a button-up shirt. So they are likely to rip Yeongwoon’s shirt off and take off their shirts when they were going to SA him. Yeongwoon is likely to grab the nearest shirt(button shirt) and put it on while running away. With this theory, some believe that they successfully go all the way and some believe they don't and Yeongwoon manages to get up, grabbing the nearest shirt and running away.
3. The man who tails Yeongwoon is likely to be sent by Taegu. Because Taegu is a thug so this kind of thing is his thing. That man might report to Taegu again about Yeongwoon getting inside a place that is suspicious and Taegu will come with his man. They might be late because Yeongwoon is all beaten up but at least they stop SA from happening. One of Taegu’s man or Taegu himself give Yeongwoon the shirt. Yeongwoon slip away from the chaos scene because he was exhausted.

The next chapter can't be the first since hes wearinv a white t shirt here but he was wearing a white shirt in 1st Chap