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What episode does this happen? I think you got the wrong drama

As of episode 3 they haven't but she wants to do it since episode 1. Once they discover the other is also a ninja who knows what might happen.

The second OST is like a cover of Love Story by BOL4. Wouldn't call it plagiarism as they are probably licensing or using the same base. Link to OST: https://www.youtube.com/watch?v=VjTtyXZOt9Y

There is a release ripped straight from their streaming service (FOD) which includes japanese subtitles (srt), so you can use a website that translates them to english. Subtitles for episode 1 were translated and uploaded to subscene this way.

Tags are made by the community or MDL staff based on available info. They wouldn't know something like that unless they have insider info or the drama is based off a novel/webtoon.

This is a typical "Second Chance Romance" or "Ex-spouse Relationship" drama. The characters are not supposed to be perfect specially in the first episodes. It's about character growth and learning to appreciate your partner.