In elementary school, Ji Soo was a judo athlete and competed at national level before giving it up due to injuries.

[6][7][8][9] In 2017, he co-starred in JTBC's fantasy romance comedy Strong Woman Do Bong-soon, playing a passionate rookie police officer.

[15] In 2021, Ji Soo was approved to play the part as the male lead role in the Korean drama River Where the Moon Rises.

He starred in the drama for six aired episodes until reported school bullying and assault accusations were made against him, hence KBS replaced Ji Soo so he was from then on removed from the show.

After completed four weeks of basic military training, he was announced to carry out the rest of his services in the assigned social worker department.

[23] In a statement posted on an online forum by an anonymous person on 2 March 2021, Ji Soo was accused of being a bully during his school years.

As I began acting, I was able to come this far due to the fact that I covered up my past, and as a result received undeserving love and attention from the public.

I now beg forgiveness to those who were undoubtedly deeply hurt for a long time, seeing me acting, and I will reflect on the unforgivable actions of my past and repent.

I feel miserable and guilty for inflicting so much damage on all of my fellow drama cast and crew members, the broadcasting station, and all those affiliated with the production, solely due to my own personal mistakes.

"[27]It was later reported that Ji Soo would be replaced by actor Na In-woo in the television series River Where the Moon Rises.

[28][29][30] KeyEast issued a statement confirming Ji Soo's activities would be halted prior to his military enlistment in October 2021.