I completely agree with your review. I also thought the father compounded the issues with his unwaranted outbursts and jealousy early on in the marriage before any real sparks (if we can call them that) started to fly -- of both his sons, especially his older son even politically, which was a bit off for me. I also agree that Nanami stood out the most and she had me wishing Hitoshi had fallen for her instead.
A great all around talent - he blew me away on How Do You Play ... and his new music video is the so much fun... I wish him all the success in the world. I could tell from the show how down to earth and a grateful person he is... best of luck!
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https://www.google.com/search?gs_ssp=eJzj4tVP1zc0LEouTza1qKowYPTiL0rMzEvOTyxRyM7MyUktAgCnCwrL&q=raincoat+killer&oq=Rainco&aqs=chrome.1.0i433i512j46i433i512j69i57j0i512l2j0i433i512j46i175i199i512j46i512j0i433i512j0i512.4510j0j15&sourceid=chrome&ie=UTF-8
https://www.soompi.com/article/1511877wpp/ji-suk-jins-fellow-msg-wannabe-m-o-m-members-to-guest-on-running-man