T1 announced a multiyear deal with former DragonX jungler Moon "Cuzz" Woo-chan on Thursday.
"We're thrilled to announce that Lee "Effort" Sang-ho and Mun "Cuzz" U-chan will be joining T1 for 2020 and beyond," T1 tweeted.
Effort's contract was first reported by ESPN's Tyler Erzberger on Monday.
With T1 extending star mid laner Sang-hyeok "Faker" Lee's contract through 2021 earlier this week, that leaves only a new top laner to complete next season's roster following the departure of Kim "Khan" Dong-ha.
T1 also needed a new jungler after Kim "Clid" Tae-min signed with Gen.G after the start of free agency.
The 20-year-old Cuzz steps into a vital role with his new team. He started for DragonX in 2019 following the departure of Han "Peanut" Wang-ho.
Cuzz broke into the professional scene with Longzhu Gaming in 2016 before moving to DragonX as a reserve for the 2018 season. He was a starter for the T1 team that placed second in the LCK 2019 regional final in September and took first at Rift Rivals 2019.
Also still unknown is whether T1 coach Kim "kkOma" Jeong-gyun will remain with the team after he was allowed to evaluate his options in free agency.
T1 was eliminated by G2 Esports in the semifinals of the League of Legends World Championship.
-- Field Level Media