Last Song 2015

CS NUMBERS 2014

Everlasting 2014

My Baby U (애기야) 2010

pray (Webtoon 'The Princess’s Guide to a Perfect Life' Original Soundtrack) Single • 2025

IRO EP • 2025

Couple - Special Single (커플 (Couple) - Special Single) Single • 2025

SIGnature EP • 2024

2024 SINGLE ALBUM [SEO IN GUK] Single • 2024

이재, 곧 죽습니다 OST Part 2 Single • 2023

Fallen Single • 2022

Minamdang (Original Television Soundtrack, Pt. 6) Single • 2022

LOVE&LOVE Single • 2022

Doom at Your Service (Original Television Soundtrack), Pt. 7 Single • 2021

All For You (inst.) Jeong Eun Ji & Seo InGuk • 61M views

[MV] 정은지 x 서인국 커플 (Couple) - Special single Official Music Video Seo InGuk • 3.5M views

Just the Way We Love Jeong Eun Ji & Seo InGuk • 4.9M views

Love U Seo InGuk • 228K views

부른다 메달 Seo InGuk • 1.2M views

Out of time Seo InGuk • 999K views

I Can't Live Because Of You (feat. Verbal Jint) Seo InGuk • 1M views

너랑은 뭐든 Seo InGuk • 797K views

화음 깡패 서인국 X 정은지가 부르는 최신판 우리 사랑 이대로 | 간주점프 EP.14-2 | 정은지, 응답하라 1997 Seo InGuk • 442K views

Finding Myself Seo InGuk • 3M views

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Sweet Korean Love Songs Playlist • YouTube Music

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K-Soundtrack Hits 2024 Playlist • YouTube Music

Stylish & Upbeat Korean Ballad Playlist • YouTube Music

Love Songs for Confession Playlist • YouTube Music

Legendary Korean Music Remake Playlist • YouTube Music

K-Drama Hits Playlist • YouTube Music

Spring Korean Music Playlist • YouTube Music

[ M/V ] Playlist • Seo In Guk • 195K views

노래부르기 [ SINGING SONG ] Playlist • Seo In Guk • 33K views

KIM JAE HWAN 823K monthly audience

XIA 4.9M monthly audience

KYUHYUN 1.91M monthly audience

CHEN 7.34M monthly audience

Yoo Hwe Seung 1.76M monthly audience

Sandeul 13.6K subscribers

Park Bo Gum 65.7K subscribers

CNBLUE 2.27M monthly audience

JUNG YONG HWA 716K monthly audience

Tae Woo Kim 6.84K subscribers