In 2004, he dropped out of middle school after failing math class and joined FC Seoul.

[2] In May 2018 he was named in South Korea's preliminary 28 man squad for the 2018 FIFA World Cup in Russia.

[3] On 2 February 2024, FC Seoul officially declared his retirement and retired his jersey number 13, and appointed him as a coach of Osan High School, a U-18 team of FC Seoul.

His given name, Yo-han, comes from the Korean translation of John (요한), apostle of Jesus.

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