The Young Men refer to a group of NPC's in Harvest Moon: Island of Happiness.
They must be unlocked before they will move onto the island. They are considered as 'sub villagers'.
Unlock: Have 10 or more sub-villagers
Likes: Can not give gifts
Dislikes Can not give gifts
He and his wife Vanessa run the Island Hotel in E.Town
Unlock: Have 15 or more sub-villagers
Likes: Turnip, Corn, Tomato, Shiitake, Toy Flower, Junk Ore, Weeds, Blue Grass
Dislikes: Potato, Eggplant, Carrot, Milk, Fodder, Red Grass, Yellow Grass, Fish (M)
LloydLanna's, he hangs out southwest of the diner after 6pm.
Unlock: Unlock Lanna
Likes: Carrot, Eggplant, Egg, Red Grass, Green Grass Junk Ore, Lumber, Fish (S)
Dislikes: Potato, Turnip, Tomato, Corn, Fodder, Milk, Weeds, Toadstool
DanielChen's shop, and will move to the Original Inn at 6pm if you have it expanded.
Unlock: Hire Gannon to Upgrade Road from Ranch
Likes: Potato, Carrot, Turnip, Eggs, Blue Grass, Green Grass, Red Grass, Orange Grass
Dislikes: Corn, Tomato, Eggplant, Weeds, Milk, Fodder, Fish (L), Bird Feed
LoganLanna's house and Pierre's house.
Likes: Carrot, Tomato, Eggplant, Milk, Egg, Pinkcat Flower, Toy Flower, Lumber
Dislikes: Turnip, Corn, Potato, Weeds, Fodder, Blue Grass, Red Grass, Orange Grass
JakeLloyd does. After 6pm he leaves the island until the next day.
Unlock: Hire Gannon to Upgrade Road Cafe/Diner
Likes: Potato, Corn, Carrot, Turnip, Milk, Toy Flower, Fish (S), Fish (M)
Dislikes: Eggplant, Tomato, Fodder, Junk Ore, Weeds, Red Grass, Fish (L), Lumber
Unlock: Unlock 30 or more sub-villagers in order to expand the Island Hotel
Likes: Eggplant, Fodder, Milk, Junk Ore, Weeds, Orange Grass, Red Grass, Egg
Dislikes: Tomato, Corn, Potato, Carrot, Turnip, Blue Grass, Green Grass, Yellow Grass