Yoon "Peanut" Wang-ho joined the Najin organization in late 2014 but was only announced as an official sub for NaJin e-mFire later in December. He finally turned 17 in February and played in his first competitive match at SBENU Champions Spring 2015 against SK Telecom T1 later that month. He shared the starting jungle position with Watch for the rest of the tournament, where NaJin finished 6th overall. NaJin placed fifth in the regular season of SBENU Champions Summer 2015 and qualified for the playoffs but they lost in the first round 2-1 to the KOO Tigers. However, Peanut did not play in any of these games. They earned enough circuit points to make it to the 2015 Season Korea Regional Finals but lost 3-0 in the first round to the Jin Air Green Wings.
During the 2016 LCK Spring Split, the ROX Tigers dominated domestically in similar fashion to 2015. They finished the regular season with a 16-2 match record, losing only to KT Rolster and Samsung Galaxy. Earning first place in the regular season gave them a bye to the finals of the Spring Playoffs, where they faced SK Telecom T1. ROX entered as the favorites this time, but still lost 3-1, earning themselves second place for the spring split.
Changed his legal name from Yoon Wang-ho (윤왕호) to Han Wang-ho (한왕호) in April 2016.
Has been known by many as, "The best jungler in the world".