[4] In 2012, Kim starred on his first main lead role as Kang-min in KBS Drama's My Shining Girl,[5] followed by SBS Plus's Late Blossom as Jung Min-chae in the same year.

[1] His family consists of his parents and a little brother named Kim Kibum,[9] who was a former member of U-KISS[10] and Xing,[11] and currently a soloist.

[20] Kim, along with the members of SS501 (except for Heo Young Saeng, who was recovering from the surgery), lent their voices to the Korean version of 2006 animated film Pi's Story.

[28] However, they stopped their activities as a group for a period of time as Park Jung-Min and Kim Hyun-Joong were given solo projects for Grease musical[31] and Boys Over Flowers series respectively.

[33] They also contributed to the Boys Over Flowers soundtrack with "내 머리가 나빠서" (Because I'm Stupid),[34] and appeared as a cameo in episode four, performing their track, "U R Man".

During this time, Kim started writing lyrics along with his brother Kibum, which includes "Want It", "The One", and "I Am" from UR Man album,[33] and "Hey G" from SS501 Solo Collection.

It is a character design brand with its first product named PiroPiro, a bear with dark circles under its eyes, representing tired office workers and those who feel the strain of work.

[47] On March 8, 2011, Kim finally released his debut solo mini album My Girl[48] with music videos for the two lead tracks "oH!

[52] After his acting debut in Black City, Kim starred on his first main lead role in KBS Drama's romantic comedy series, My Shining Girl in March.

[5] He played Kang-Min's character, a top star in the Korean entertainment business who is a bit temperamental; charming but rude and attempts to transform from a singer into an actor.

Kim Hyung Jun "The First", the name of the concert, was held on March 9 at the Woori Art Hall at the Olympic Park, organized by SPLUS Entertainment and managed by SH Creative Works.

[70] He plays the role of Han Ji Hye's younger brother Mong Gyu, an unemployed post-graduate with cute charms and a carefree attitude.

[77] Lotte JTB's official reason for choosing him is that: "He always has a bright and healthy image and has a positive influence as a singer and actor both domestically and aboard.

[83] The song is an acoustic medium R&B produced by Kim, while the music video has an innocent love story theme, filmed on Hanseo University' airfield, and capturing 'beautiful sights' in the sky.

[84] Kim held fan events and love showcase for the Japanese release of the song at Shibuya Public Hall, Tokyo on the October 21 and 22.

[89] Right after, Kim held his second solo concert in Korea entitled He, His Story on February 8 at Yonsei University, celebrating three years since his debut as a soloist.

Kim planned to kick off his '2014 LIVE TOUR – Endless Story' on the 10th and perform a total of 7 concerts in Tokyo, Nagoya, and Osaka until November 28.

An international website, Allkpop, pointed out: "[T]hey were able to kick the door down and paved the road to the Japanese market that many of the current idol groups enjoy today..."[93] Furthermore, SS501 also influenced the Korean word maknae ("youngest member") in Japan.

It is common in K-Pop bands to include their positions in their group such as the leader and main vocalist whenever they introduce themselves; in Japan, the word is often associated with Kim Hyung-jun.

[95] The tour proved his popularity in the continent as both fans and the press media followed him everywhere he went, causing traffic on the road and calling of police to maintain safety.

Stars from across Asia took part to raise funds through their performances and all proceeds were donated to Singapore's Society for the Physically Disabled (SPD).