If you open any site in the KakaoTalk app, then the user-agent of the user will be (for example):
Mozilla / 5.0 (Linux; Android 10; SM-G973F Build / QP1A.190711.020; wv) AppleWebKit / 537.36 (KHTML, like Gecko) Version / 4.0 Chrome / 88.0.4324.93 Mobile Safari / 537.36; KAKAOTALK 2109201
But if the page contains a link with target="_blank", then the user-agent of the user will be:
Mozilla / 5.0 (Linux; Android 10; SM-G973F Build / QP1A.190711.020; wv) AppleWebKit / 537.36 (KHTML, like Gecko) Version / 4.0 Chrome / 88.0.4324.93 Mobile Safari / 537.36
This only happens with target="_blank" links, if the link is with target="_self", then everything is fine. Why is KakaoTalk disguised as Chrome?