passerby-b

The photos were taken in Dongshi of Taichung, Taiwan.
I could not describe of its call, but is certainly different from that I heard in HK.

HFCheung

No.  It is Japanese Bush Warbler 日本樹鶯 or Manchurian Bush Warbler 遠東樹鶯.  The difference is not clear to me but Manchurian Bush Warbler is more common (according to the Taiwan checklist).

passerby-b

Thanks a lot! After refering to Wild Birds of Taiwan by 廖本興 P.199 and P.200, I think it is a Manchurian Bush Warbler. P.200 has the following description "遠東樹鶯，頭上紅褐色，體色較紅，眉線明顯"。I had apply more colour saturation to the photo below to blow up the red brown colour of the crown.