[9] In late December 2007, Eru released a statement revealing his intentions of fulfilling his military service duties in the latter half of 2008, since he became a Korean citizen 2 years ago.
Eru stayed there for four weeks to receive basic training and was subsequently assigned to public service duty.
The first single from his 2nd album, "까만안경" ("Black Glasses") which features singer Daylight, gained significant popularity among young people and topped on- and offline charts.
[14] "흰눈" was also successful, reaching #1 on various online charts and winning several awards, including Cyworld's Song of the Month (January 2007).
[15][16] The music video for "흰눈" was shot in Sapporo, Japan[14] and featured Eru and entertainer Lee Hyun-ji.
Aside from his own music videos, Eru appeared in female singer Magolpi's debut music video "Flight Girl", where his role was as a composer, along with six other Korean artists, including Yoochun of TVXQ, Kangin, Heechul and Shindong of Super Junior, Park Joon-hyung of g.o.d, and Kim Jang-hoon.
[17] The lead single from this album, "둘이라서" ("Because We Are Two"), enjoyed enormous popularity, winning SBS's Bonsang Award.
The star-studded music video cast for "겨울나기" included Eru, actresses Lee So-yeon and Kim Ja-ok, actor Park Sang-myun, trot singers Tae Jin-ah and Song Dae-kwan, comedians Lee Kyung-kyu and Ji Sang-ryeol, singer Kim Heung-gook, and others.
[21] In 2017, Eru had a supporting role in the drama series You Are Too Much, where his character Park Hyun-Sung had increased screen time in later episodes, and he also sung the end credits song "Sad Love".