During the "Mystery in the Building" main quest in Arknights Endfield, you encounter a moment where Yvonne asks you to play music from her vinyl collection. This interaction takes place in her lab after you've navigated through the Research Center and defeated enemies blocking your path.
Quick answer: The vinyl Yvonne wants is not one of the first two options you're offered at the vinyl player. You must explore her lab to find additional records in a box, then return to the player to select the correct track that satisfies her.
The vinyl player interaction
When you first approach the vinyl player in Yvonne's lab, the game presents two dialogue choices. Neither of these initial options is what Yvonne is looking for. The game is designed so that both selections fail to meet her preference, and you'll need to try them both to progress.
Finding the correct vinyl
After trying both initial options, cross the room to locate a box containing additional vinyl records. Interact with this box to access Yvonne's full collection. Once you've examined the box, return to the vinyl player and select from the expanded options now available to you.
Playing the correct vinyl triggers a cutscene that advances the quest. This music choice motivates Yvonne to continue calibrating the power output for her equipment, moving the story forward toward the next objective.
Progression and rewards
Completing the vinyl selection correctly is a required story beat in "Mystery in the Building." The quest rewards you with Origeometry, T-Creds, Intermediate Combat Records, Protoprism, Arms INSP Kits, a Basic Expansion Core, Valley Regional Development Metrics, and Operational EXP upon completion.
The vinyl choice itself is not optional—you cannot skip this interaction or choose to ignore Yvonne's request. The game will not proceed to the next phase of the mission until you've selected the vinyl that satisfies her.
