Koh Soon Kim Shidoin is the founder and main instructor of Aikido Shudokan Hong Kong.

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He started his Aikido journey since 2009 under Ramlan Ortega Shihan (6th dan) and Kent Yew Sensei (5th dan) from Aikido Shudokan Malaysia (ASM). He obtained his 1st dan from Ramlan Ortega Shihan in 2012 . Subsequently, he received his 2nd dan in 2015 after grading under Joe Thambu Shuseki Shihan, Mark Hadiarja Sensei (5th dan) and Ramlan Ortega Shihan (6th dan). 

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In January 2022, Koh Soon Kim Shidoin received his instructor title (Shidoin) from Aikido Shudokan International

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He has been teaching both children and adult classes in different dojos under ASM around Kuala Lumpur. After relocating to Hong Kong for work since 2021, Koh Soon Kim Shidoin started Aikido Shudokan Hong Kong to further spread the knowledge of Yoshinkan Aikido.