Since last year, the husband of a serious and hard-working office worker has been enthusiastic about difficult "investment" topics such as "asset formation" and "virtual currency". Hana, a chaste part-time housewife in her fifth year of marriage, implicitly told her husband, "Don't get too absorbed in it ...". One day my husband came home with his boss. I heard that the man who is the boss is a "billionaire" who is famous as the best charismatic trader in the company ...!