I don't believe in Tom's sincerity; but this is inter nos.
我不相信汤姆是有诚意的; 不过这是不能对外人讲的。
英语百科
Inter Nos
Inter Nos (Icelandic:Okkar á milli: Í hita og þunga dagsins) is a 1982 Icelandic drama film directed by Hrafn Gunnlaugsson. It was selected as the Icelandic entry for the Best Foreign Language Film at the 55th Academy Awards, but was not accepted as a nominee.