Yang Siha

On April 9, 2018, Siha debuted as a member of NOIR with the group's first mini album Twenty's Noir. On May 2, 2024, it was revealed that six of the members, including Siha, won their lawsuit against LUK Factory for contract termination. They claimed that the agency violated various obligations including providing minimum human and material resources to support their entertainment activities and attempting to transfer their exclusive contract to another agency without their consent.

Their contract was effectively terminated in July 2022 and a lawsuit was filed. In response, LUK Factory filed a lawsuit seeking damages from the members. On May 4, Siha shared that he will be retiring from the industry to focus on his personal life.