Place it at the end of a scene, after a mysterious button cue opens the doorway and the group is ready to leave, then let a background music loop carry the closing credits.
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This two-second clip is a Korean farewell addressed to everyone, spoken clearly as a portal opens. It feels polite and a little dramatic, like waving goodbye to a whole group at the end of a scene. The uploader presents it as the sound heard when a portal opens.