A technical solution in Ju Weisang's fingering music Twilight and Homesickness!

That's a string-playing technique, of course, not a common thumb-playing technique. Here is the technique of tapping the strings with the fingertips of the index finger, middle finger and ring finger of the right hand. Note that instead of tapping the strings with our nails, we suddenly press them with the flesh of our fingertips, which gives us a feeling of tapping. After hitting, don't let go of the finger of your right hand, keep pressing on it to eliminate the sound you played before, and at the same time, tap the strings with your fingers and bang the fingerboard (here it should be called tapping the strings). This is another way to play the strings, so that the sound will be broken for a short time, unlike the thumb, the sound will last. Because the notes you played before were all on the strings of 1, 2, 3, tapping the strings with these three fingers can completely mute the sound.

This is the string-playing technique used by Ju Weisang here. In addition, when he plays at dusk, he blends into the overall style, and the strings here are very light. You got what you heard. With a little practice, since it's dusk, you should be able to get used to it soon.