On 28 October 2014, Tan Kok Seng was suspended for 3 years from participating in all activities organized or sanctioned by the Singapore Taekwondo Federation (STF) for breaching the coaches’ code of conduct.
He appealed to the Management Committee to consider lifting his suspension on grounds of good behavior and continued contribution to taekwondo.
The Management Committee, in its monthly meeting on 17 January 2017, accepted his appeal. The Committee also put on record that if he misconducted himself in future, in any way, it would not be so forgiving.
In response to the decision, Kok Seng expressed his appreciation and assured the Committee that he would abide by code of conduct and observe the rules and regulations of the STF without fail.