The choices appear over and over again and again.

Thanks for the log, and screenshot. As you mentioned; it eems to be a dialogue issue; specifically for Abigail.
As she has a prompt for that "Sun_28" in her vanilla game files.

And, the 3 mods at the bottom are the ones that edit Abigail's dialogue. You'll want to try temporarily removing them one at a time, and retry talking to her. That should show you the broken one.

Code:
03:28:03    ERROR    game    An error occurred in the base update loop: System.Collections.Generic.KeyNotFoundException: The given key 'Sun_28' was not present in the dictionary.
   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   at StardewValley.Dialogue.chooseResponse(Response response) in stardewvalley\Farmer\Farmer\Dialogue.cs:line 971
   at StardewValley.Menus.DialogueBox.receiveLeftClick(Int32 x, Int32 y, Boolean playSound) in stardewvalley\Farmer\Farmer\Menus\DialogueBox.cs:line 371
   at StardewValley.Game1.updateActiveMenu(GameTime gameTime) in stardewvalley\Farmer\Farmer\Game1.cs:line 5473
   at StardewValley.Game1._update(GameTime gameTime) in stardewvalley\Farmer\Farmer\Game1.cs:line 4807
   at StardewValley.Game1.Update(GameTime gameTime) in stardewvalley\Farmer\Farmer\Game1.cs:line 3974
   at StardewModdingAPI.Framework.SCore.OnPlayerInstanceUpdating(SGame instance, GameTime gameTime, Action runUpdate) in SMAPI\Framework\SCore.cs:line 1113

---

03:26:08    TRACE    SMAPI    Unique Response Core edited Characters/Dialogue/Abigail.ko-KR.
03:26:08    TRACE    SMAPI    Content Patcher edited Characters/Dialogue/Abigail.ko-KR (for the '(CP) Please, Remember My Marriage' content pack).
03:26:08    TRACE    SMAPI    Content Patcher edited Characters/Dialogue/Abigail.ko-KR (for the 'Dialogue Expansion for All Friend-able Characters for Korean' content pack).
 
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