Thank you so much to fisherman111 for the upscaled videos.
PC user here,
at first i played those videos with MPC-HC media player as default and VLC, and it was unwatchable.
then I tried switch to PotPlayer media player, and it worked.
TLDR : for upscaled videos, and if you use PC (I don't know for mobile) tried install PotPlayer media player and play the video with it. It worked.