I would not consider 4 pm to be "evening".
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The correct answer would be 4 o'clock in the afternoon. In my opinion after 5 o'clock or 6 o'clock would be considered evening. It also depends on where you live. If the sun starts to go down at 4 o'clock, you could pass it off as evening. I'm not sure what it's like in Korea. Confirm with multiple sources before you take my words for granted.
I'm in UK and in winter at 4 pm is dark.
4 pm in winter is evening to me. And because of that we use it all the year though