Make sure that you have "Gulim" font. OpenRCT2 uses that by default.
 
	If you do not have that font(linux, macos), you have to edit config.ini's font section.
 
	 
 
	
	file_name = "NanumGothic.ttf"
	font_name = "NanumGothic"
	x_offset = 1
	y_offset = -2
	size_tiny = 11
	size_small = 12
	size_medium = 12
	size_big = 13
	height_tiny = 12
	height_small = 14
	height_medium = 14
	height_big = 16
 
	(You need to install NanumGothic)