| Event | Rerun | Synopsis | Medals | OST | Gallery | Trivia |
Lingering Echoes is the nineteenth major event and thirteenth Side Story in Arknights.
Operations[]
Clear 1-10 to access the LE operations.
| Afterglow Hall | LE-ST-1 • LE-TR-1 • LE-1 • LE-2 • LE-3 • LE-4 • LE-ST-2 • LE-TR-2 • LE-5 • LE-6 • LE-7 • LE-8 • LE-ST-3 |
|---|---|
| Back Alleys | LE-EX-1 • LE-EX-2 • LE-EX-3 • LE-EX-4 • LE-EX-5 • LE-EX-6 • LE-EX-7 • LE-EX-8 |
Back Alleys operations are available in the second week.
All LE operations are worth 28 
.
Annihilation[]
[Global] Lingering Shangshu Trails is introduced as the new Rotating Mission on January 9, 2023.
Operators[]
The following Operators will gain 50% extra Trust (except from Annihilation):
- Operator Modules can now be upgraded; please see the article and the respective Operators' Modules section for further information.
- Operator Modules added for Mystic Casters and Guardian Defenders.
- The following Operators receive a new Module:
Headhunting[]
- Main article: Headhunting/Banners/Former/2022
The Dissonanzen headhunting banner is featured.
Sheet Musics[]
All LE operations award 
Sheet Music when cleared, with more being given when the player clears the operation for the first time. Back Alleys operations only award Sheet Musics when cleared for the first time.
Sheet Musics can be exchanged for various items in the Composer's Mailbox.
The best LE operations to farm Sheet Musics are LE-5, LE-6, and LE-7 due to their high 
Sugar Pack, 
Grindstone, and 
Semi-Synthetic Solvent drop rates, respectively.
Spy Base[]
The Spy Base missions' rewards can be claimed until January 17, 2023.
| Mission | Reward | ||
|---|---|---|---|
| Clear LE-1. |
| ||
| Clear LE-2. |
| ||
| Clear LE-3. |
| ||
| Clear LE-4. |
| ||
| Clear LE-5. |
| ||
| Clear LE-5 with 3 stars. |
| ||
| Clear LE-6. |
| ||
| Clear LE-6 with 3 stars. |  | ||
| Clear LE-7. |
| ||
| Clear LE-7 with 3 stars. |  | ||
| Clear LE-8. |  100 | ||
| Clear LE-8 with 3 stars. |
| ||
| Clear LE-EX-1. | 60 | ||
| Clear LE-EX-2. | 60 | ||
| Clear LE-EX-3. | 80 | ||
| Clear LE-EX-4. | 80 | ||
| Clear LE-EX-5. | 80 | ||
| Clear LE-EX-6. | 80 | ||
| Clear LE-EX-7. | 100 | ||
| Clear LE-EX-8. | 100 | ||
| Clear LE-EX-8's Challenge Mode. |  | ||
| Clear LE operations other than LE-TR-1 and LE-TR-2 15 times. | 80 | ||
| Clear LE operations other than LE-TR-1 and LE-TR-2 45 times. | 100 | ||
| Clear LE operations other than LE-TR-1 and LE-TR-2 85 times. | 120 |
Composer's Mailbox[]
To buy all items with limited stock from the Composer's Mailbox, the player must spend 4755 
.
The Composer's Mailbox is open until January 17, 2023.
| Ware | Price | Stock |
|---|---|---|
 1 |
200
|
1 |
1 |
240
|
1 |
1 |
280
|
1 |
1 |
320
|
1 |
1 |
360
|
1 |
 1 |
150
|
3 |
 2 |
75
|
2 |
 1 |
100
|
5 |
 1 |
50
|
10 |
 1 |
40
|
10 |
 1 |
30
|
10 |
 |
50
|
1 |
 |
50
|
1 |
 |
40
|
1 |
 |
25
|
4 |
 |
15
|
5 |
 1 |
15
|
10 |
 1 |
5
|
60 |
 1 |
12
|
15 |
 1 |
8
|
10 |
 5K |
7
|
100 |
 2 |
5
|
25 |
 2 |
3
|
50 |
 2 |
1
|
120 |
 1 |
4
|
25 |
 1 |
2
|
50 |
 1 |
4
|
25 |
 1 |
3
|
25 |
 1 |
2
|
25 |
 1 |
6
|
4 |
 10 |
2
|
200 |
20 |
1
|
Unlimited |
Store[]
The following pack is available in the Packs Store, which can only be purchased once per account:
| Pack | Content | Price |
|---|---|---|
Dissonance Chip Pack 
|
 8  5 210K |
US$2.99 |
Outfits[]
The following outfits are available in the Outfit Store:
| New |
|---|
Furniture[]
The Afterglow-Styled Music Room furniture theme is available; some of its parts are awarded from Spy Base while the others are available in the Composer's Mailbox and Furniture Store.
Miscellaneous[]
The following enemies have been reclassified.
Operator Records/Paradox Simulations[]
New Operator Records/Paradox Simulations are added for the following Operators:
| Operator | Operator Record(s) | Paradox Simulation |
|---|---|---|
| Future Woven | Scattered Pieces | |
| Distant Relic | Not added | |
| Lone Lamp | Not added | |
| Filter Stars | Flickering Meander | |
| Nameless Flower | Not added | |
| South Wall | Lump of Gold | |
| Endless Journey | Pure Power | |
| Armor and Crossbow | Rain of Fire |
CVs[]
New CVs are added for the following Operators.
| Operator(s) | CN CV | EN CV | KR CV |
|---|---|---|---|
| – | Lizzie Waterworth | – | |
| Mang Yin (credited as "Duduru" in Global) | – | – | |
| – | – | Choi Seung-hoon | |
| Jia Yue (credited as "Hart Lau" in Global) | – | – | |
| – | – | Hong Seung-hyo | |
| – | – | Chae Min-ji | |
| Miao Yang (credited as "Mia Miao" in Global) | – | – | |
| Shisi (credited as "Jingxia Liu" in Global) | – | – | |
| Vila | – | – | |
| – | Ina Marie Smith | – | |
| – | – | Kim Yu-rim | |
| – | Sarah Ovens | – | |
| Muyaruilin (credited as "Rylynn" in Global) | – | – | |
| Z-kun (credited as "Z" in Global) | – | – | |
| – | – | Sung Hye-won | |
| – | – | Soyeon | |
| – | Polly Eachus | Lee Sae-byeok | |
| – | – | Kim Ga-ryeong | |
| – | – | Lee Ja-myeong | |
| – | – | Lee So-eun | |
| – | – | Seo Yu-ri | |
| – | – | Kim Bo-young | |
| Qiwen (credited as "Ellen Wang" in Global) | – | – | |
| Zi Mao (credited as "Kousou Mao" in Global) | – | – | |
| – | Samantha Dakin | – | |
| – | Hollie Taylor | Kim So-young | |
| Ma Yang | – | – | |
| – | – | Kang Eun-ae | |
| Zhang Hong (credited as "Elivia" in Global) | – | – | |
| – | Susie Riddell | – | |
| – | – | Lee Hyun-jin | |
| Chen Yanyi (credited as "Yee Chen" in Global) | – | – | |
| Xu Chen | – | – | |
| – | Heather Nicol | – | |
| – | Clare Louise Connolly | Lee Yu-ri | |
| – | – | Lee Bo-hee | |
| – | Jennifer Amour | – | |
| – | Claudia Jolly | Gabin | |
| Shuang Liang | – | – | |
| – | – | Kim Na-yul | |
| – | – | Jang Ye-na | |
| Zhao Yang (credited as "Kyle" in Global) | – | – | |
| – | Gregg Lowe | – | |
| – | – | Kang Sae-bom | |
| Xiao Mi (credited as "Mimia" in Global) | – | – |
