Classic Odyssey is the 2.5 studio album by SG Wannabe. It is said that a 1 billion won (₩1,000,000,000) budget went into SG Wannabe's new remake album. It included hits such as "My Heart's Treasure Box" (내 마음의 보석상자).
When 2005 was over, SG Wannabe was ranked at #1, with over 400,000 copies sold of their 2nd album, Saldaga, and 12th, with 147,047 copies sold of their remake album on the year-end chart.
| Title | Lyrics | Music | Arrangements |
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| 1. | "내 마음의 보석상자" ("My Heart's Treasure Chest") | Lee Ju Ho | Lee Ju Ho | Cho Young Soo | |
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| 2. | "비 오는 거리" ("The Rainy Street") | | | | |
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| 3. | "꿈의 대화 (R&B Soul Version)" ("A Dreamy Conversation") | Lee Bum Yong | Lee Bum Yong | Cho Young Soo | |
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| 4. | "사랑의 썰물" ("Tide of Love") | Kim Chang Gi | Kim Chang Gi | Cho Young Soo | |
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| 5. | "유리창엔 비" ("The Rain On The Window", duet with "Ock Ju-hyun") | | | | |
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| 6. | "소녀" ("Young Girl") | Lee Jung Han | Lee Jung Han | | |
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| 7. | "이별 아닌 이별" ("A Separation Which Wasn't One") | Oh Tae Ho | Oh Tae Ho | Kim Tae Hyun (mdrdney) | |
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| 8. | "사랑과 우정사이" ("Between Love and Friendship") | Oh Tae Ho | Oh Tae Ho | Seo Jae Ha | |
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| 9. | "비 오는 날의 수채화" ("Art On A Rainy Day") | Kang In Won | Kang In Won | Cho Young Soo | |
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| 10. | "눈물나는 날에는" ("On The Days I Cry") | Yoo Young Seok | Yoo Young Seok | | |
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| 11. | "혜화동" ("Anger East") | | | | |
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| 12. | "종이학" ("Paper Crane") | Lee Gun Woo | Lee Bum Hee | | |
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| 13. | "가을사랑" ("Autumn Love") | Min Jae Hong | Min Jae Hong | | |
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| 14. | "단발머리" ("Short Hair") | | | | |
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| 15. | "내 마음의 보석상자 (Music Video Edit Version)" ("My Heart's Treasure Chest") | Lee Ju Ho | Lee Ju Ho | Cho Young Soo | |
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| 16. | "꿈의 대화 (Acoustic Version)" ("Dreamy Conversation") | Lee Bum Yong | Lee Bum Yong | Cho Young Soo | |
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