Accounting Lee Seo-jin in a Muscle Shirt Surprises BIBI at WATERBOMB, Even Spraying Water Himself (‘My Grumpy Secretary’)By AdminBitAugust 10, 20260 [Sportschosun reporter Jung Yoo-na] Lee Seo-jin from “My Grumpy Secretary” took care of singer BIBI, who was attending the WATERBOMB Music Festival.