On Nov. 16, Liiv SANDBOX announced that they've signed Lee "Clozer" Joo-hyeon to a 2-year deal. In their announcement, they said, "We are pleased to announce the signing of Clozer, as our mid for next 2 years. We hope your support and look forward to us in the future."

Clozer had great evaluations even before his debut from coaches and players in the scene from his great performance in solo queue and academy scrims. As soon as he reached the eligible age of 17, Clozer had his debut in T1. In that match, he was voted as the Player of the Game and started his career successfully. Although Clozer underperformed under pressure, his talent made people look forward to his future.

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In 2021 spring, Clozer had more chances to play in official games with T1's rotating starting roster. However, as the starting lineup got fixed with Lee "Faker" Sang-hyeok ast the starting member, he was benched.

Liiv SANDBOX released most of their roster as free agency came around. With Clozer signed, their current roster consists of jungler Kim "Croco" Dong-beom, Clozer, and sub top laner Jeon "Howling" Ho-bin.