Mun is also the CEO of Shinhwa Company, the home agency of his group, with Lee Min-woo as co-CEO since 2011, and with the remaining members—Kim Dong-wan, Shin Hye-sung, Jun Jin and Andy Lee—as shareholders.
In 1996 he returned to Korea and joined SM Entertainment as a trainee and was featured as a rapper on label mate girl group S.E.S.'
On March 24, 1998, with the stage name Eric, he debuted as leader and main rapper of group Shinhwa with their single "해결사" (The Solver) on KM Music Tank.
[7] In early 2006, Mun was injured on the set of MBC drama Wolf, resulting in it being pulled off air after four episodes.
Mun was injured whilst shooting a scene, near Namdaemun in Seoul, where he was to save co-star Han Ji-min from being run over by a car.
[8] In August, after the successful run of Super Rookie, especially in Japan,[6] Mun collaborated again with its writers in Invincible Parachute Agent (also known as Korea Secret Agency).
Before his army enlistment, Mun appeared in a period drama for the first time in his acting career with Strongest Chil Woo.
[10] With 30 million wons per episode for Strongest Chil Woo, Mun was the highest paid singer-turned-actor in the industry at the time.
Because of his back injury from the filming of Wolf, Mun served non-active duty after undergoing four weeks of basic training.
[14] After being discharged, Mun's first project was supposed to be KBS' action drama Poseidon opposite Kim Ok-vin, set for broadcast in July 2011.
[24] Mun's rap is featured on Brown Eyed Girls' Ga-in's digital single "Nostalgia", released on November 30, 2012.
He did not re-sign another contract with Top Class Entertainment and no longer has any running of group Stellar whom he helped the management to produce and promote the original line up.
In 2015, Discovery of Love was nominated for the 2015 Rockie Award[38] in the Melodrama category alongside 30 Vies (Canada), EastEnders (UK), Grey's Anatomy (USA), My Sunshine (China), and Mysterious Summer (Japan).
In a 2015 Instiz discussion post about viewers' favorite drama characters, Mun's Kang Tae-ha Discovery of Romance stays in top 10 at #6.
After Shinhwa's 18 Anniversary in March, Mun returned to acting and appeared in the South Korean TV cable (tvN) drama Another Oh Hae-young with Seo Hyun-jin.
Mun was chosen to be the model for Jean Michael Basquiat a new premium golf wears and accessories by CJ E&M and ULOS, a Men's cosmetics & skincare by Ostuka Korea.
In the web drama, Eric played a rookie employee who was trying to survive the hierarchy in a corporate environment, meanwhile he was reigning as the King in Lineage2 Revolution game.
The couple got married on July 1, 2017, at Youngnak Church in Jung District, Seoul, South Korea after five years of dating.
[47] In 2018 Eric and Shinhwa had the whole year to celebrate the group's 20th anniversary since debut with various activities starting with a remake music video "All Your Dream",[48] followed by a special fan party on March 24 & 25.
[55] 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.
[56] The following month, on February 16, he held a birthday fan meeting "2019 ERIC's Moonday" at Kwanglim Art Center, BBCH Hall.
It was reported that Eric and Go Joon-hee are in talk to join KBS's fantasy rom-com drama "Perfume"[60][unreliable source?]
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.