Dortmund's successful journey is strongly connected to Haller's lionheart

by Oliver Trust

BERLIN, May 23 (Xinhua) -- Sebastien Haller is the epitome of tranquility and serenity. His constant smile seems to appear naturally, particularly when he's discussing the topic at the forefront of everyone's mind.

For many, it's a given that Borussia Dortmund will secure its first national championship since 2012 in the upcoming weekend.

The 28-year-old French striker shares the op