Responses
Read these two in this specific order, tho not a sequel they're kinda connected, also don't be put off by the art at the start, it changes for the better in just a few chapters :
Song of Reverberation
https://www.mangago.zone/read-manga/song_of_reverberation/
The Promise
https://www.mangago.zone/read-manga/the_promise/
more recs -
I'm the Most Beautiful Count
https://www.mangago.zone/read-manga/i_m_the_most_beautiful_count/
Death Match!
https://www.mangago.zone/read-manga/death_match_1/
[Manhwa Only] Similar to Red Candy, A Hunter Wants to Live Quietly (eventual), Zero Day Attack, Murderous Lewellyn etc