He surprised the public bysharing the official poster of his photo exhibition "Oh! Happy Day" through official SNS channels and fan cafes on Tuesday, gaining explosive popularity from fans. With Ong Sung-woo in his natural style, the poster which features the daily life of comfortable and relaxed Sung-woo raises questions and expectations about the photo exhibition.

Ong sung-woo's photo exhibition 'Oh! Happy Day' was organized to celebrate his 25th birthday on August 25. The exhibition will display special photos such as a closed-door childhood, and a photo that chronicles Ong-Sung-Woo. Also, colorful contents related to the him are expected to provide special memories to fans as they fill in the photo exhibition more plentifully.

The fan club "Oh! Happy Day," a photo exhibition of Ong sung-woo that runs from Thursday, Aug. 22to Wednesday, Aug. 28, will run at 8 p.m. on Wednesday, July 17, and the general reservation will run at 8 p.m. on July 19.

"On the occasion of his birthday in August, we have prepared a space where he and his fans can share precious memories," a Fantagio source said. "Despite his busy schedule, Sung-Woo actively worked for the comfort group and prepared various attractions." "I hope he and his fans share more affectionate time and memories through this photo exhibition."

Meanwhile, Ong Sung-woo has been cast in the role of Choi Joon-woo, the main character of JTBC's new Monday-Tuesday drama "The Eighteen Moment," set to premiere on July 22.