I agree with your afterthoughts1. that's screenwriter's mistake for overlooking that minor detail on Haesook and…
It felt like they had too many (wonderful) ideas, but not enough episodes to squeeze everything in. I think they should have made it a bit longer just to give it time to develop properly, but there might have been many factors at play that we are not aware of (budgeting, actors schedules, directors etc).
There were also many inconsistencies: Hae Suk is seen in the first few episodes among many dogs and seems fine, but later in the series she develops a severe "allergy" to them. Same with the Pastor, he was fine? even adopted 2 strays, but in the last two episodes, after his identity was revealed, develops an allergy as well for the sake of the "that's her son" plot. Which made me feel like the screenwriters were in the process of creating episode 3 while episode 2 was being filmed for example. Like they weren't sure where the drama was going themselves? There were also many rules that seems to be normal for other characters, but not our main couple? The whole reincarnation process seems to have been skipped? where they chose their future lives and see their past lives. But otherwise? I love this drama and the emotions it brings out. I can easily overlook those flaws for the sake of the ideas that the authors tried to convey.
Why did I waste my time on this? I literally laughed at one part when one of the "main villains" was talking with someone on her phone, but her screen was on and you could see the menu, not the call. It was confusing half the time, the time-travel made no sense at the end.
Your age difference comment... Well... he's old and she's a gold digger so it fits actually? Like she throws tantrums and cries when she wants something from him and he denies her. Then when she cries and plays the "abused orphan" card he takes her out shopping and yey, all the tears are gone and she's all smiley and happy again (I gag at those scenes). She always tries to manipulate him with her "why was I even born if you don't want me" speech. The only thing still keeping me on the show is to see the scenes between the Reaper and the Goblin, nothing else.
There were also many rules that seems to be normal for other characters, but not our main couple? The whole reincarnation process seems to have been skipped? where they chose their future lives and see their past lives.
But otherwise? I love this drama and the emotions it brings out. I can easily overlook those flaws for the sake of the ideas that the authors tried to convey.
The only thing still keeping me on the show is to see the scenes between the Reaper and the Goblin, nothing else.