'The Moon Rising River' Lee Ji-hoon X Choi You-Wha returns to Goguryeo as Silla Four Symbols on April 13, 2021 Four Symbols Goguryeo Goh Kun Kim So-hyun Lee Ji-hoon + Pyeong-gang Four Symbols Goguryeo Goh Kun Kim So-hyun Lee Ji-hoon Pyeong-gang