Natural.

He disappears for a whole week, without leaving any track or notice behind.
It's a very peaceful week for the standards, since bored Tero tends to cause a lot of arguments and fights in the house, especially with MinHo. He and QinShi have been his favourite targets ever since he set a foot in that house.
The reason? He is jealous sick of all the kindness and attention QinShi gets. He is a very jealous person, he has always been, even in the future.

~ He reappears in the abandoned village on his own, after that time.
He is in a perfect shape, just a little messy in look, with some leaves and petals stuck all over his body. Beside that, he seems coated in a very intense and fresh pine fragrance.
He takes some steps inside and looks around, pondering where to start.
His heart is beating madly fast, but start to pound for good as he finally perceives the scent he was trying to catch since the first moment.

He follows the trail and finally sees him. His eyes get teary instantly.
Tero approaches MinHo, moving right in front of him while the other pushes the little brother behind himself in a protective way.
"What do you want?" says MinHo, harshly. "You are back and come straight to bother us?"
He extends his resembling hands towards the other's face. "LianBi..."
"Are you drunk?" MinHo slaps his hands away. "What is wrong with you again?" He turns around, picks QinShi up and walks away.

He remains motionless in the middle of the room, staring at the direction where MinHo went, with tears rolling down his cheeks.