Seems to be another batch of boards. I don’t have this “bai hai hong” printed on mine.
At first glance I can’t see any shorts either, but soldering looks mediocre. Next i would use the multimeter to check all components for shorts, continuity and resistor values, here is a circuit diagram . You could also measure current when light is off with multimeter and power supply, this might give a hint where the current flows. Wait a few seconds after shutting down before you check until the mcu goes to sleep. And with an oscilloscope you could check Pin 5 and 6 of the mcu whether there are any spikes.
If there aren’t any new findings I would re-solder all pads and see if it helps.