Hi Xuky,
I see from BirdnetCN that there may be some confusion, though the web translator leaves a lot to be desired and I obviously didn't explain why I suggested Large-billed Leaf Warbler.
Attached is the original image posted on Birdnet, which I've added to, hope this is ok?
A - The first thing to note is the long 1st primary which looks roughly about half the length again of the longest primary covert. This would be roughly the same length as the longest primary covert on an Arctic Warbler, see the second image, a bird I took in Beidaihe. (Confusion possible between Large-billed and Two-barred Warbler which also has a long first primary and can look somewhat similar).
B - What appears to be a developing hooked tip, Arctic has a slight tip but the combination of other features is more indicative of Large-billed.
C - Supercilium of the two species appears rather similar, stopping just short of the bill but tends to be whiter in Arctic. I note that there is virtually no obvious sign of rictal bristles on your bird, but this may be an indication of age, they develop as they get older.
D - The bill is rather dull and dark. On an Arctic, I would expect to see a much yellower lower mandible with a darker tip and yellow cutting edge to the upper mandible.
E - Primary projection shorter than the length of the tertials. On Arctic Warbler, the primaries are roughly equal to the tertial length.
Hope this makes sense!