At that time, Kyung Hee was not known as a major force in college basketball, but the trio eventually led the team to a back-to-back sweep of the regular season title, the championship and the MBC Cup.

[1] Doo gained the reputation as a 'behind the scenes' player who never drew as much attention as his more illustrious and skilled teammates but stepped up when needed.

In 2013, he played a key role in Kyung Hee reaching the final of the tournament for a fourth consecutive year, by orchestrating a comeback from a 20-point deficit to defeat Hanyang University in the semifinals.

[4] During his senior year, the Kyung Hee team were unable to overcome Korea University, losing to them in both the U-League championship and the MBC Cup final.

[8][2] Despite his stellar performances during the season, he was controversially cut from the final squads for both the William Jones Cup and 2018 Asian Games.

[9] Doo enlisted for mandatory military service in May 2018 and was assigned to the Sangmu team after completing basic training.

[10] He formed a partnership with shooting guard Heo Ung and his college teammate Kim Jong-kyu, who had joined DB that season.