Any Bls that has a hidden child/hid the child With a chasing arc??

Hyacinth - https://www.mangago.zone/read-manga/hyacinth/

Kekkon Shite Kudasai! - https://www.mangago.zone/read-manga/kekkon_shite_kudasai/

Struggle - https://www.mangago.zone/read-manga/struggle_1/

Surge Looking For You (the plot isn't entirely based on it but there's an arc where he runs away without his partner knowing he's pregnant) - https://www.mangago.zone/read-manga/surge_looking_for_you/

https://www.mangago.zone/read-manga/stigma_2/

https://www.mangago.zone/read-manga/percentage_of_love/