Ryusenso Main Branch is a Japanese ramen shop in Haeundae, Busan. It serves tonkotsu ramen and asari ramen, both known for their thick, rich broth. The bowls come with chashu and soft-boiled egg, and a spicy ramen can also be ordered. Seating is arranged for solo diners, and the tonkotsu ramen is on the salty side.