Seosan Maaesamjonbul (Rock-Carved Buddha Triad) is carved into a huge rock cliff at the entrance to Bowonsa Temple at Gayasan Mountain. The Rock-Carved Buddha was discovered in 1958, and is considered the oldest and one of the most outstanding Buddha rock carvings in Korea.

Standing Buddha stands in the center, the cross-legged Buddha is to the right, and Standing Bodhisattva is on the left. The main Buddha, Yearaeipsang (Standing Buddha) is 2.8m high.

All sculptures carved in the middle of Baekje (6th century) are called "Baekje's Smile," named for their trademark bright smiles. The appearance of the smile changes depending on the direction of the sunlight, so these statues were designated as National Treasure No. 84. The best time to see the smile is from 9-11 a.m.

The location, an important site along a key transportation route from China to Baekje, is on the way to Buyeo from the Taean peninsula. The masterful work represents the active interchange of culture with China during that time period.