Following a heated argument, Peanut's determination to pursue a career in professional gaming persuaded his father, who supported him with the condition not to blame them if things did not go as planned.

[7] In the 2016 LCK Spring Split, the Tigers secured the top spot in the regular season standings, earning a bye directly into the playoff finals where they faced SKT.

The subsequent summer split saw them once again claiming the top spot in the regular season standings, leading to a playoff finals match against KT Rolster.

[8][9] By winning the Summer Split Finals, the Tigers secured a spot in the 2016 League of Legends World Championship as the LCK's top seed.

[8] After advancing past the group stage, the Tigers defeated EDward Gaming in the knockout quarterfinals and moved on to face SKT in the semifinals.

[12] At the end of the year Peanut won the 2016 KeSPA Cup, as ROX Tigers defeated Kongdoo Monster in the final.

[14][4] In the 2017 LCK Spring Split with SKT, Peanut played in a total of 36 games, tallying 133 kills, 65 deaths, and 199 assists.

[15] SKT finished atop the regular season standings, receiving a bye directly into the playoff finals, where they faced KT Rolster.

[20] SKT moved on past the group stage of the event and defeated Flash Wolves in the playoff semifinals, earning a spot in the 2017 MSI Final against G2 Esports.

Peanut ended the game with nine kills, no deaths, and six assists, securing his first-ever international title with the MSI victory.

[25][26] During the season, Peanut shared playing time with Kang "Blank" Sun-gu, plating in 24 games and accumulating 41 kills, 53 deaths, and 107 assists.

However, after a challenging game one where Peanut faced difficulties capitalizing on Longzhu rookie Moon "Cuzz" Woo-chan and primarily focused on mid lane kills rather than seizing other opportunities on the map, he was substituted out for Blank.

[28] After making it past the group stage and winning their quarterfinals matchup, SKT faced Royal Never Give Up in the semifinals.

[31] In the Worlds final against Samsing Galaxy, Peanut started the match, but after SKT lost games one and two, he was taken out in favor of Blank.

[27] On November 25, 2017, Peanut signed with Longzhu Gaming, reuniting with his former ROX Tigers teammates Kim "PraY" Jong-in and Kang "GorillA" Beom-hyun.

[36] The team finished atop the regular season standings with a 16–2 record, advancing them directly to the 2018 LCK Spring Split finals.

While his performance improved slightly in the Summer Split, Gen.G finished in sixth place during the regular season, and Peanut failed to reach the World Championship for the second year in a row.

[49] Despite Peanut's generally strong showing in the LPL regular season, he faced challenges adapting to the meta at the 2020 World Championship, and LGD failed to make it to past the group stage.

[50] On November 30, 2020, Peanut made a return to the LCK by signing with Team Dynamics, which later rebranded to Nongshim RedForce in December 2020.

[51][52] In the 2021 LCK Spring Split, Nongshim had middling results, finishing sixth place in the regular season, but secured a spot in the playoffs.

They faced Hanwha Life Esports on the second day of the qualifier, with the winner advancing to the 2021 World Championship, but they lost the match, 0–3, ending their season.

[78] As only the 1st and 2nd place got a chance to represent LCK at the 2024 Mid-Season Invitational, this marked the end of Hanwha Life Esports' spring split.

Coined as a "living ward" during his early ROX days, Peanut faced criticism for relying on pushing lanes to create invasion opportunities without establishing vision for sustained advantages or tracking the enemy jungler.

This deficiency persisted during his stint with SK Telecom T1 in 2017, where the team struggled with mid-game vision control, hindering their ability to recover from deficits.

[87] SKT benched Peanut in 2017 due to his tendency for overzealous plays, a trait commonly associated with amateur players transitioning into the professional scene despite having top-tier mechanical skills.

Unlike his previous experiences, he no longer had the luxury of a frequent isolated winning top lane dynamic to exploit.

Acknowledging the impact of the shifting meta, Peanut highlighted the significant influence of the transition from a jungle-centric to a more lane-focused style on his gameplay.

The diminishing effectiveness of his preferred aggressive playstyle, which involved invading and applying pressure from the lanes, was further compounded by the increasing importance of catchup experience towards the end of 2017.

Notably, Peanut excelled in catching opponent junglers in unexpected positions, initiating battles strategically to secure victories.

His ability to synchronize movements with teammates resulted in stable lane skirmishes, showcasing a more cohesive and effective approach compared to his earlier years.