Now it remains to be seen whether the ROK military listens to President Yoon or the ROK National Assembly.
If the martial law in South Korea can be lifted by the National Assembly and the ROK military pulls back, Yoon's impeachment is only a matter of time.
Otherwise, the PLA NTC and CTC better be ready to respond in case things go south in the peninsula (e.g. Yoon starts to hatch some funny ideas about its northern neighbor to solidify his rule, or that factions within the ROK military factions clash due to differing loyalties).
Might be a good time for some PLAN warships and PLAAF warplanes to conduct maneuvers in and over the Bohai and Yellow Seas.