U Sung Eun (유성은) & Kwak Si Yang (곽시양)
유성은 (U Sung Eun) & 곽시양 (Kwak Si Yang) — 아시나요 (OST Persevere, Goo Hae Ra) 04:46
U Sung Eun (유성은) & Kwak Si Yang (곽시양) — 아시나요 (Do You Know) [Persevere, Goo Hae-Ra] 04:40
유성은 (U Sung Eun), 곽시양 (Kwak Si Yang) — 아시나요 (Do You Know) 04:44
U Sung Eun and Kwak Si Yang — Do You Know (Perseverance, Goo Hae Ra OST) 04:40