Ghost Messenger(2014)

The dangerous underworld is policed by ghost messengers who use their shape-shifting cell phones to maintain order and go after bad guys. While hunting a dangerous spirit, Master Kang Rim accidentally gets trapped inside his cell phone. That cell phone falls into the hands of Little Kang Rim, a 12-year-old boy who lives with his grandfather, who owns an antique store. Little Kang Rim has the unique ability to see spirits, and he finds himself pulled into service to help Master Kang Rim.

With the help of Bari, Master Kang Rim’s commander, can LIttle Kang Rim set things right with the underworld?

(Source: VIKI, edited)