| 2010, April |
| Weekend Events of April [04-07] |
| 2010, March |
| Refinery Storm [03-31] |
| 2010 Easter Day [03-26] |
| Weekend Double Exp Event [03-26] |
| Refinery Storm [03-17] |
| Fallas Festival Quests [03-06] |
| 2010, February |
| Lantern Festival Quests [02-25] |
| Valentine's Day Quests [02-05] |
| Spring Festival Quests [02-05] |
| How to Get Refinery Items [02-01] |
| Horse Racing [02-01] |
| Refinery and Stabilization [02-01] |
| 2010, January |
| Tart Maker Event [01-30] |
| Shopping Rush For Horse Racing [01-27] |
| Rice Porridge Event [01-21] |
| Labyrinth Permit [01-04] |
| 2009, December |
| Power Arena [12-30] |
| Texas Hold'em Poker [12-13] |
| Alternative Equipment [12-13] |
| Clan War [12-9] |
| 2009, November |
| Achievement System [11-30] |
| Summon Old Friends Back to Win Epic Gear [11-30] |
| The 2nd Classic CO Server: Royalty [11-27] |
| The 1st Classic CO Server: Liberty [11-18] |
| Couples PK Tournament [11-4] |
| Arena [11-4] |
| Martial Arsenal [11-4] |
| 2009, October |
| The 4th Super Guild War [10-17] |
| 2009, September |
| Demon Box [09-24] |
| 2009, July |
| Raiding Clans
Expansion [07-16] 1. Steed 2. Clan 3. New Map: Frozen Grotto 4. New Monsters |
| 2009, May |
| Enlightenment [05-21] Interaction [05-21] |
| 2009, April |
| The 3rd Super Guild War [04-04] |
| 2009, March |
| Equipment Bonus Quests Seaon 2
[03-23] 1. Tomboy's Marriage 2. Desert Blood 3. Hero's Wings 4. Family Feud 5. Desert Treasure 6. Desert Expedition 7. Power Book |
| 2009, February |
| Quiz Show [02-18] |
| 2009, January |
| Class PK War (Ninja) [01-06] |
| CO VIP Services [01-03] |
| 2008, December |
| Ninja [12-22] |
| The Second Super Guild War [12-13] |
| Honor Halo [12-03] |
| 2008, November |
| Equipment Bonus Quests [11-18] |
| Talismans of Power [11-12] |
| Extreme PK Tournament [11-06] |
| 2008, September |
| Shopping Mall [09-24] |
| PK Rules [09-19] |
| Composition [09-19] |
| 2008, August |
| Expball [08-27] |
| World PK Tournament [08-24] |
| Flame Lit Event [08-20] |
| Athletic Competitions [08-06] |
| 2008, July |
| Class PK War [07-16] |
| 2008, June |
| Path Finding [06-18] |
| 2008, May |
| Super Guild War Contest [05-21] |
| 2008, April |
| Mentor and Apprentice System [04-28] |
| Suspicious Items [04-28] |
| Trade Partners [04-28] |
| Item Lock [04-28] |
| Merchant Account [04-28] |
| Hand in Hand [04-16] |
| 2008, March |
| Nobility Rank [03-05] |
| 2007, November |
| +10 ~ +12 Items [11-26] |
| Monster Hunter Quest [11-26] |
| Demon Exterminators Quest [11-26] |
| Sockets on Non-Weapon Equipment [11-26] |