The 21-year-old told reporters on Thursday that he first heard about the Scottish champions' interest back in September.
But the deal was only finalised earlier this week when Celtic paid Suwon Samsung Bluewings a reported £2.5 million.
Oh. pic.twitter.com/daOYJptGKZ
— Celtic Football Club (@CelticFC) January 26, 2023
![10MA TOPICS! [KOREA FA] Celtic sign Korea Republic striker Oh Hyeon-gyu](https://image.eaff.com/index/6807.jpg)
![10MA TOPICS! [KOREA FA] Shin Jin-ho joins Incheon United](https://image.eaff.com/index/6804.jpg)
![10MA TOPICS! [JAPAN FA] Japan's Iwabuchi joins Spurs on loan](https://image.eaff.com/index/6803.jpg)
![10MA TOPICS! [JAPAN FA] Qatar 2022 disappointment fuelling Mitoma's improvement](https://image.eaff.com/index/6802.jpg)
![10MA TOPICS! [KOREA FA] Barrow, Kim leave Jeonbuk](https://image.eaff.com/index/6801.jpg)
![[WOMEN'S OLYMPIC GAMES] Hopefuls discover Paris 2024 Asian Qualifiers Round 1 opponents](https://image.eaff.com/index/6798.jpg)