On 29 July 2024, he signed a four-year contract with Swiss Super League side Grasshoppers.

[6] His debut could not have started off better, with Lee scoring within 44 seconds in a 3–1 victory over FC Sion on 24 August 2024.

[7] Lee played for the South Korean national under-20 team in the 2023 FIFA U-20 World Cup.

He scored against France and Ecuador while helping his team reach the semi-finals.

This biographical article related to South Korea association football is a stub.