Last Song

2015

CS NUMBERS (CS NUMBERS)

2014

Everlasting

2014

My Baby U (애기야)

2010

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

THE X

EP • 2023

Fallen

Single • 2022

Seo

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

Couple

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All For You (instrumental)

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우리 사랑 이대로 (Just the way we love)

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Out of time

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너랑은 뭐든

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부른다 메달

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Love U

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서인국 - 어린날(youth)

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Finding Myself

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Star

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Bright Korean Ballad

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Sweet Korean Love Songs

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K-Soundtrack Hits 2024

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Beautiful Korean Duet

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Stylish & Upbeat Korean Ballad

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Love Songs for Confession

Playlist • YouTube Music

K-Drama Hits

Playlist • YouTube Music

Legendary Korean Music Remake

Playlist • YouTube Music

Christmas Theme Korean Music

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Spring Korean Music

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[ M/V ]

Playlist • Seo In Guk • 145K views

노래부르기 [ SINGING SONG ]

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2am

1.4M monthly audience

K.Will

49.6K subscribers

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2.36M monthly audience

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17.2K subscribers

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12.2K subscribers

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743K monthly audience

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67.6K subscribers

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51.2K subscribers

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31.7K subscribers