There are many groups involved in the production of songs in the industry, but you'll appreciate that writing the title songs is privilegedly admirable. I prepared a selection of title songs whose lyrics were written completely by the members. (Title tracks that are NOT contributed by any other producer or songwriter except members)
12) PLT - IGOHOLIC
Album: IGOHOLIC (2018)
Lyrics: Jin Woo, Gaho, Villain, June, Moti
Composition: Sang Jun, Jin Woo, Gaho, Villain, June, Moti
Arrangement: LONG DRIVE2, Sang Jun, Jin Woo
Not only this song, R&B grup PLT' each song is produced by members.
11) STRAY KIDS - MIROH
Album: Clé 1 : MIROH (2019)
Composition: 3racha, Brian Atwood
Arrangement: Brian Atwood, Bang Chan
All the songs of the group come from the 3RACHA, the sub-group consisting of Bang Chan, Changbin and Han.
10) BTOB - I'll be your man
Album: New Men (2016)
Lyrics: Im Hyun-sik, Lee Minhyuk, Peniel, Jung Il-hoon
Composition: Im Hyun-sik, EDEN, Nathan
Arrangement: Im Hyun-sik, EDEN, Nathan
9) iKON - RHYTHM TA
Album: Welcome Back (2015)
Lyrics: B.I, Bobby
Composition: B.I, June, FUTURE BOUNCE
Arrangement: FUTURE BOUNCE
iKON is also one of the gruops that gives their albums their own color, I wanted to add one of my favorite songs to the list.
8) B1A4 - Solo Day
Album: Solo Day (2014)
Lyrics: Jinyoung, Baro
Members produce all the song of their group, but since it's one of the iconic songs, I chose Solo Day to put it on the list.
7) WINNER - REALLY REALLY
Album: Fate Number For (2017)
Lyrics: Yoon, Mino, Hoony
Composition: Mino, Yoon, Kang Uk-jin
Arrangement: Kang Uk-jin
WINNER also has a group that makes all their songs but I wanted to put this song, that makes them born from the ashes, on the list.
6) BLOCK B - H.E.R
Album: H.E.R (2014)
Music: Zico, Pop Time
Almost all the title songs of Block B also produce by members, but I wanted to put the song "H.E.R" on the list, which was a big hit.
5) DAY6 - Shoot Me
Album: Shoot Me: Youth Part 1 (2018)
Lyrics: Young K
Composition: Young K, Wonpil, Jae, Sungjin, Hong Ji-sang, Lee Woo-min
Arrangement: Hong Ji-sang, Lee Woo-min
As expected from a band group, they make their own songs. But I wanted to put "Shoot Me" on the list, which I listened a lot last year.
4) JYJ - In Heaven
Album: In Heaven (2011)
Lyrics: Kim Jaejoong
Composition: Kim Jaejoong
Arrangement: BJD, MDS
All the albums of the group are produced by the members but I wanted to put "In Heaven" on the list because the lyrics of this song enshrine in my heart.. The lyrics of the song "Get Out" also belonged to Kim Jaejoong and Park Yoochun; the song was composed by these two members.
3) 2PM - Go Crazy!
Album: Go Crazy! (2014)
Lyrics: Jun. K
Composition: Jun. K, Danny Majic, DJ Nure, Fingazz, Dustin Tavella
Arrangement: Jun. K, Danny Majic, DJ Nure, Fingazz, Dustin Tavella
Jun.K has played an active role in the b-sides of the group, and after their rookie period, we see that he also took part in the title tracks. "My House" is another title song written by Jun.K but I wanted to add my favourite 2PM song Go Crazy to the list.
2) BIGBANG - Haru Haru
Album: Stand Up (2008)
Composition: G-Dragon, Daishi Dance
Arrangement: Daishi Dance
The song is written by G-Dragon, the main songwriter and composer of their most of songs. Since Haru Haru was a song from their rookie period and one of the group's hit songs, I chose Haru Haru to put it on the list.
1) CNBLUE - Cinderella
Album: 2gether (2015)
Lyrics: Jung Yong-hwa
Composition: Jung Yong-hwa
Arrangement: Jung Yong-hwa, Lee Sang-ho
The main songwriter, composer and arranger of the song is Yong Hwa. But Yong Hwa is a member of the group that gives color to their all albums.
Same groups haveother title songs that I didn't add to the list, but written by members. You can add as comments if you wish.
Source: komca + wikipedia + youtube
(* Accuracy of all data has been checked from Komca.)