I like that the PD had both Young-ho and Young-cheol appear in Season 34 of I Am Solo.

If PD Nam had only cast one of them, either Young-ho or Young-cheol, for this season, I don't think it would have been as fun as it is now.
If only Young-cheol had appeared and Young-ho had been someone else, it would have been uncomfortable to constantly watch Young-cheol acting so cocky. But since Young-ho is there with him, it's fun because we can see various (?) sides of Young-cheol. Also, if Young-cheol hadn't been there, Young-ho and Hyun-sook would have likely had a calm and smooth connection, but now that unexpected situations can arise, it's much more entertaining.