| Yesterday | 
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| Released | October 19, 2015 (2015-10-19) | 
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| Recorded | 2015 | 
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| Language | Korean | 
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|  "Yesterday"Released: October 19, 2015 (2015-10-19)
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 Yesterday (Korean: 꼭 어제; RR: Kkok Eoje)[2] is the second EP released by South Korean singer Kim Junsu, under his stage name XIA on October 19, 2015.[3] The first music video was released for the title song of the same name.[4] The EP contains eight tracks, three of which are acoustic versions of previously released songs.[1] 
 Track list
 | Title | Lyrics | Music | 
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| 1. | "Yesterday" (꼭 어제 (Kkok eoje)) | Lucia | Lucia | 04:35 | 
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| 2. | "OeO (Feat. Giriboy)" | Xia, J.Kimb, Giriboy | Xia, Jeong Jae-yeop | 04:13 | 
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| 3. | "Midnight Show (Feat. Cheetah)" | Xia, Park Il | Xia, Park Il | 03:20 | 
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| 4. | "The Rabbit and the Turtle" (토끼와 거북이 (Tokkiwa geobugi)) | Hoe Jang-nim | Hoe Jang-nim | 04:32 | 
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| 5. | "Silk Road (Feat. BewhY)" (비단길 (Bidangil)) | Xia, Kwon Bin-gi | Xia, Kwon Bin-gi | 03:08 | 
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| 6. | "Tarantallegra" (acoustic version) | Juno | Xia | 03:28 | 
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| 7. | "Incredible" (acoustic version) | Xia, Bruce 'Automatic' Vanderveer, Ebony Cunningham | Bruce 'Automatic' Vanderveer, Ebony Cunningham | 04:21 | 
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| 8. | "Flower" (꽃 (Kkot) acoustic version) | Xia, Kim Tae-wan | Xia, Kim Tae-wan | 04:05 | 
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Charts
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