Another angle: Could "18 Dad Friend 2" be a nickname or a fan-translation title for a different movie? Sometimes fans create their own titles for movies they're excited about. If that's the case, the actual title might be different. Maybe I should look up Korean movies coming out in 2025 and see if any fit the description. However, without more details, it's difficult. Also, predicting titles and plot points for unreleased films is speculative.