‘수고’(soo go) means ‘good job!’ in Korean(‘수고했어요’ sugo haess-eoyo).
Whenever you open and close this notebook, you can see this letter. Feel the notebook saying to me ‘good job! : )’.
GOOD JOB NOTE BOOK
I define this 'Easy design'
Easy design means designing easily. Design is something that is not huge, artificial, serious, complex, difficult, but the transferring what you think.