Woori Bank has teamed up with rising YouTuber Kim Sun-tae, known as "Chungju Man," to produce promotional content as the lender looks to expand its marketing reach among younger audiences, industry officials said Wednesday. The bank recently filmed a video with Kim though a release date has not been set. Woori employees said the YouTuber was seen at the bank's headquarters in Jung District, Seoul, earlier this week. The collaboration is said to be a one-off project rather than a formal brand ambassadorship. Kim, a former civil servant, rose to prominence for his creative content while working in media relations at the Chungju City Government. His work is widely regarded as a successful case of YouTube marketing in the public sector. After resigning in February, Kim launched his own channel which quickly gained traction, surpassing 1 million subscribers within 48 hours. Operating under the slogan "Promoting everything in the world," Kim has since drawn a flood of partnership offers from companies and public institutions. Dozens of firms and state-run agencies left comments on his first vid