2019–2020: New management, solo activities and return to acting
On January 1, 2019, it was announced that Eric has joined his bandmate Andy at TOP Media. To everyone's surprise, Eric creates his own YouTube channel aguTV to share a various contents, from cooking, outings to how he failed to get a ticket for his own fan meeting.
His first broadcast activity for 2019 was a cast member for season 3 of tvN's variety show "Will The Locals Eat It?" in America (also known as 4 Wheeled Restaurant). The show premiered on April 18.
Eric and Shinhwa held their 21st anniversary concert, 'Chapter 4' at KSPO Dome on April 20 and 21, 2019.
On May 22, Mun was cast for MBC's new variety show, "The Barber of Seville". The filming took place in Seville, Spain and broadcast every Thursday from July 11 – Sep.12th.
Eric was also expected to make a come back to drama this year. It was reported that Eric and Go Joon-hee are in talk to join KBS's fantasy rom-com drama "Perfume" but he declined the offer. On November 5, Eric was confirmed as lead actor for Channel A's drama, "Yoobyeolna! Chef Moon" with Go Won-hee as lead actress. The drama is expected to be broadcast in March 2020.
On April 1, 2020, it was reported that Eric and Yoo In-na are reviewing offers to star in MBC's rom-com drama 'The Spy Who Loved Me'. About 2 months later, on June 22, Eric was confirmed as lead actor for MBC's rom-com drama 'The Spy Who Loved Me' together with Yoo In-na and Lim Ju-hwan. The drama is scheduled to premiere sometime in October 2020.