[4] He made his acting debut in 2010 in the Korean drama Personal Taste and also had a role in the series Hogu’s Love (2015).

[5] Lim began studying film and acting at Daejin University's Department of Theatre and Visual Arts in 2010.

[6] Lim later was a student of Kyunghee University Graduate School of Business's Department of Culture & Arts Management while an active member of 2AM.

[14] In 2010, he collaborated with IU for the song "Nagging" for TV show We Got Married, which reached No.1 on several online music charts.

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He also starred opposite Lee Min-jung in Lunch Box on the single-episode anthology MBC Best Theater, followed by omnibus film, Acoustic.

In 2013, he took on the role of the Crown Prince in The Fugitive of Joseon, in which a doctor struggles to save his daughter from a terminal illness.

[18] Later that year, Seulong and Kim Seul-gi were cast in the leading roles in a remake of the webtoon series Infinite Power.

[20] On 2 January 2015, Seulong's agency announced that he had been confirmed for new tvN's upcoming drama Hogu's Love.

He played an idol who gets caught up in a scandal with an actress (Han Chae-young) who has a teenage daughter (Jin Ji-hee) that has a crush on him.

According to a spokesman for Universal Music Korea, Avicii's agency decided on Seulong for the Korean version "after monitoring various artists because they found his voice the most suitable and beautiful."

On 4 August, Swings teamed up with female soloist G.NA, 2AM's Seulong, and producer/singer Yoon Jong Shin to release Summer Song "Pool Party".

In the same month at "2014 JYP NATION ONE MIC" concerts in Korea, Seulong and 2 pm member's Taecyeon's collaboration stage, they performed an unreleased new song titled "U Don't Know", which was co-written by both of them, for the first time.

[29] Singer-songwriter Shim Hyun Bo released his fourth album with a new single "It's Cold" in collaboration with Seulong on 2 February 2015.

Mnet "Unpretty Rapstar" released Track 2 "Good Start 2015″ featuring AOA's Jimin and Seulong on 27 February 2015.

Seulong was selected as ambassador for the 2012 Jecheon International Music & Film Festival along with actress Son Eun-seo.

In 2012, Seulong and Jinwoon were selected as Brand Ambassadors for Galaxy Note Day held in Busan and Gwangju.

[32] On 15 July 2013, JIMFF announced that Seulong and Korean actress Nam Bo-ra were appointed to be honorary ambassadors for the 9th Jecheon International Music & Film Festival.