Sinchon is one of Seoul's busiest student and shopping districts — Yonsei and Sogang are right here, and the main street fills up by afternoon. Towing a suitcase through it is no fun, so leave your bag at Sinchon Station (Line 2) and explore hands-free.
Coin lockers at Sinchon Station
Sinchon Station has T-Locker coin lockers at 4 spots, about 79 in total, near Exit 5 and along the B1 passage that connects to the department store. That is a decent bank for a Line 2 stop, so one cluster being full usually does not mean the station is out. See each spot and how many are free now, by size, on the Sinchon Station page.
Prices are the same across Seoul — about ₩2,200 (small) to ₩4,400 (large) for four hours, then an hourly charge. The screen offers English and you pay by card, no ID needed.
Will a suitcase fit?
A large locker is 50 × 90 × 60 cm inside. If you are unsure about a 28-inch case, see locker sizes and prices. Rather than guess after dragging it down the stairs, check the live large-locker count first.
When they are full
Demand peaks on evenings and weekends. Check live availability on the station page; if it is full, Hongdae (Hongik Univ.) is one stop west on Line 2 and has far more lockers, or see the full Seoul luggage storage guide.
Sources: prices, sizes and hours from the Seoul Metropolitan Government (T-Locker); spots, counts and availability from Seoul Open Data.