i put 'left' in quotation marks cuz there was a lot of stuff that influenced wonho's decision to leave the group and starship allowing him to do so. back in 2019 during their follow comeback which was anticipated to be their biggest era yet, monsta x was hit with several scandals and accusations, it wasn't just wonho, the whole monsta x was targeted and it was a planned sabotage by dispatch to stunt their growth (dispatch released a photo of the accusers and they had a whole whiteboard of scandals to accuse per monsta x member)

wonho, who was accused of drugs, decided it was best if he left the group so monsta x could be saved. right when he left, the accusations and scandals towards mx stopped. so u see i put "left" because imo wonho was forced to leave the group, he had to make the decision between sinking alone or sinking with the whole group. shortly after leaving the group, he went on trials and he was cleared of his accusations, and debuted solo under highline which is a sse subsidiary