No Coaching Rule Applies at all events run by ONE Sports Hong Kong 

Why Is Coaching During a Match Is Not Allowed in Tennis? 

by Brenton Barker

https://thechamplair.com/tennis/why-cant-players-talk-to-coaches/

by Fred Simonsson 

https://tennispredict.com/why-is-coaching-not-allowed-in-tennis/

Whether the results or the decisions is at expectations, we advice all court-side spectators to KEEP CALM & LET THE PLAYERS PLAY. 

If caught by the parent-in-charge, umpire, or our staff,  a warning is giving out initially for illegal coaching.  If it continues, we will give a gentle advice to leave tennis court until the matches are completed.