Fans of Ong Seong-wu, you've officially been christened!
The former Wanna One member, who embarked on his solo career this year, gave the announcement on his staff Twitter page.
"Wishing WELO a happy birthday. Thank you so much for celebrating with us," his Twitter caption read. "I hope we can comfort each other warmly in the future. WELO, I love you guys so much!"
According to a post on his fan cafe, WELO could have three possible interpretations in Korean.