Yoo Seung-ok, who attended Kang So-ra Park Seo-joon Cell Return, 'sexy clavicle line' on June 27, 2019 On the afternoon of the 24th, a new product launch event for the LED mask brand 'Cell Return' was held at the Four Seasons Hotel in Gwanghwamun, Seoul.Model Yoo Seung-ok poses.