Start Hanja Script language for Korean
Sorry, that's not how things work for Korean speakers. Nobody uses Hanja in their daily life in 2020. Proposal to mix Korean and Hanja in domain name got quite a lot of resist in 2018 when it was submitted to ICANN.
Hanja usage is basically now in the form of disambiguation and a hanja mania's area, and most words are expressed in Hangul. No hanja required for any expressions in Korean. We indeed borrow words in Hanja, but we display them in Korean. Nope. If they want to use Hanja in interface, they should be segregated in their own area, not in the way where you steal the Hangul's area.