When Jin reaches 4 hearts, you can talk to him before 11:00 AM on a sunny day (NOT Sunday) and he will ask you to meet him at the Sundae Inn for a date at 12:00 PM.
Make sure you're inside of the Sundae Inn by 12:50 PM in order to see the event. If you no-show, you will lose hearts with him.
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Jin (ウォン, Won) is one of the available bachelors that you can marry in Harvest Moon: Tree of...