Ji-woo knelt on one knee on the ground under the pressure of the changing gravity while enduring three continuous attacks of magic, even though it had vanished when it came into contact with his body. He then screamed because he felt tightness and pain, not because of those powerful magics but from the pressure of his body weight, which had increased more than a dozen times.
That was because Ji-woo's weight was not in line with his fit physical appearance. Although he was neither big nor fat, he weighed around 300 kg. That hadn't been counted with the weight on his wrists and ankles, which totaled more than 1.5 tons. Thus, the weight he was carrying was something that could not be underestimated by the naked eye.
Therefore, Ji-woo found it tough to move. He felt like a giant building had been placed on his shoulders all of a sudden.
Even so, he was able to endure it for the next few seconds until the moment his weight reached a limit he couldn't handle.