A sentence ending used to explain past or present facts or gently contradict the listener.
When to use
explaining situation, responding to someone, soft contradiction
The nuance
Attach '-ㄴ데요' to past tense verbs/adjectives without a batchim, '-은데요' if there is a batchim. For present or future tense, use '-는데요'. Mainly used to provide information, respond, or gently contradict the listener.
