One popular one could be 'Cinta di Ujung Senja'. It tells a heart - touching love story between a young man and a woman in an Indonesian setting with all the cultural nuances that make it special.
You could search on specific manhwa forums or communities. Sometimes, fans share subbed versions there. Another option is to check social media groups dedicated to manhwa, as people often share links or resources for finding subbed content.
I'd suggest checking out the manga from the point where the anime ended. Sometimes, the anime might make some minor changes, but the general plot continuation should be clear. You could also look for recommendations from fellow fans to get a precise starting point.
You can start by checking out some local Indonesian streaming platforms. They often have a collection of dramas with sub - indo options. Some might require a subscription though.